diff --git a/.github/workflows/build-example-corne-nice_nano.yml b/.github/workflows/build-example-corne-nice_nano.yml
index 488bb84..2337d84 100644
--- a/.github/workflows/build-example-corne-nice_nano.yml
+++ b/.github/workflows/build-example-corne-nice_nano.yml
@@ -46,7 +46,8 @@ jobs:
             shield=""
           fi
           echo "::set-output name=shield-arg::${SHIELD_ARG}"
-          keyboard=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
+          keyboard_split="$keyboard"
+          keyboard_base=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
 
           configfile="${GITHUB_WORKSPACE}/miryoku/config.h"
           echo '// Copyright 2021 Manna Harbour\n// https://github.com/manna-harbour/miryoku' > "$configfile"
@@ -72,7 +73,7 @@ jobs:
 
           if [ -n "${{ matrix.kconfig }}" -a "${{ matrix.kconfig }}" != 'default' ]
           then
-            kconfig_file="config/$keyboard.conf"
+            kconfig_file="config/$keyboard_split.conf"
             echo "${{ matrix.kconfig }}" > "$kconfig_file"
             cat "$kconfig_file"
             cp "$kconfig_file" "$artifacts_dir"
@@ -82,13 +83,13 @@ jobs:
           outboard_dir=".github/workflows/outboards"
           if [ -n "$shield" ]
           then
-            outboard_file="$outboard_dir/$keyboard.shield.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.shield.outboard"
           else
-            outboard_file="$outboard_dir/$keyboard.board.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.board.outboard"
           fi
           if [ ! -f "$outboard_file" ]
           then
-            outboard_file="$outboard_dir/$keyboard.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.outboard"
           fi
           if [ -f "$outboard_file" ]
           then
diff --git a/.github/workflows/build-example-tbkmini-nice_nano_v2.yml b/.github/workflows/build-example-tbkmini-nice_nano_v2.yml
index d9f1e20..cd222cb 100644
--- a/.github/workflows/build-example-tbkmini-nice_nano_v2.yml
+++ b/.github/workflows/build-example-tbkmini-nice_nano_v2.yml
@@ -46,7 +46,8 @@ jobs:
             shield=""
           fi
           echo "::set-output name=shield-arg::${SHIELD_ARG}"
-          keyboard=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
+          keyboard_split="$keyboard"
+          keyboard_base=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
 
           configfile="${GITHUB_WORKSPACE}/miryoku/config.h"
           echo '// Copyright 2021 Manna Harbour\n// https://github.com/manna-harbour/miryoku' > "$configfile"
@@ -72,7 +73,7 @@ jobs:
 
           if [ -n "${{ matrix.kconfig }}" -a "${{ matrix.kconfig }}" != 'default' ]
           then
-            kconfig_file="config/$keyboard.conf"
+            kconfig_file="config/$keyboard_split.conf"
             echo "${{ matrix.kconfig }}" > "$kconfig_file"
             cat "$kconfig_file"
             cp "$kconfig_file" "$artifacts_dir"
@@ -82,13 +83,13 @@ jobs:
           outboard_dir=".github/workflows/outboards"
           if [ -n "$shield" ]
           then
-            outboard_file="$outboard_dir/$keyboard.shield.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.shield.outboard"
           else
-            outboard_file="$outboard_dir/$keyboard.board.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.board.outboard"
           fi
           if [ ! -f "$outboard_file" ]
           then
-            outboard_file="$outboard_dir/$keyboard.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.outboard"
           fi
           if [ -f "$outboard_file" ]
           then
diff --git a/.github/workflows/build-inputs.yml b/.github/workflows/build-inputs.yml
index 7250e39..e83924a 100644
--- a/.github/workflows/build-inputs.yml
+++ b/.github/workflows/build-inputs.yml
@@ -98,7 +98,8 @@ jobs:
             shield=""
           fi
           echo "::set-output name=shield-arg::${SHIELD_ARG}"
-          keyboard=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
+          keyboard_split="$keyboard"
+          keyboard_base=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
 
           configfile="${GITHUB_WORKSPACE}/miryoku/config.h"
           echo '// Copyright 2021 Manna Harbour\n// https://github.com/manna-harbour/miryoku' > "$configfile"
@@ -124,7 +125,7 @@ jobs:
 
           if [ -n "${{ matrix.kconfig }}" -a "${{ matrix.kconfig }}" != 'default' ]
           then
-            kconfig_file="config/$keyboard.conf"
+            kconfig_file="config/$keyboard_split.conf"
             echo "${{ matrix.kconfig }}" > "$kconfig_file"
             cat "$kconfig_file"
             cp "$kconfig_file" "$artifacts_dir"
@@ -134,13 +135,13 @@ jobs:
           outboard_dir=".github/workflows/outboards"
           if [ -n "$shield" ]
           then
-            outboard_file="$outboard_dir/$keyboard.shield.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.shield.outboard"
           else
-            outboard_file="$outboard_dir/$keyboard.board.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.board.outboard"
           fi
           if [ ! -f "$outboard_file" ]
           then
-            outboard_file="$outboard_dir/$keyboard.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.outboard"
           fi
           if [ -f "$outboard_file" ]
           then
diff --git a/.github/workflows/src/include/build-steps.yml.m4 b/.github/workflows/src/include/build-steps.yml.m4
index 5e77fc7..c1af0cb 100644
--- a/.github/workflows/src/include/build-steps.yml.m4
+++ b/.github/workflows/src/include/build-steps.yml.m4
@@ -14,7 +14,8 @@
             shield=""
           fi
           echo "::set-output name=shield-arg::${SHIELD_ARG}"
-          keyboard=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
+          keyboard_split="$keyboard"
+          keyboard_base=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
 
           configfile="${GITHUB_WORKSPACE}/miryoku/config.h"
           echo '// Copyright 2021 Manna Harbour\n// https://github.com/manna-harbour/miryoku' > "$configfile"
@@ -40,7 +41,7 @@
 
           if [ -n "${{ matrix.kconfig }}" -a "${{ matrix.kconfig }}" != 'default' ]
           then
-            kconfig_file="config/$keyboard.conf"
+            kconfig_file="config/$keyboard_split.conf"
             echo "${{ matrix.kconfig }}" > "$kconfig_file"
             cat "$kconfig_file"
             cp "$kconfig_file" "$artifacts_dir"
@@ -50,13 +51,13 @@
           outboard_dir=".github/workflows/outboards"
           if [ -n "$shield" ]
           then
-            outboard_file="$outboard_dir/$keyboard.shield.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.shield.outboard"
           else
-            outboard_file="$outboard_dir/$keyboard.board.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.board.outboard"
           fi
           if [ ! -f "$outboard_file" ]
           then
-            outboard_file="$outboard_dir/$keyboard.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.outboard"
           fi
           if [ -f "$outboard_file" ]
           then
diff --git a/.github/workflows/test-boards.yml b/.github/workflows/test-boards.yml
index ef4d9ca..b030452 100644
--- a/.github/workflows/test-boards.yml
+++ b/.github/workflows/test-boards.yml
@@ -52,7 +52,8 @@ jobs:
             shield=""
           fi
           echo "::set-output name=shield-arg::${SHIELD_ARG}"
-          keyboard=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
+          keyboard_split="$keyboard"
+          keyboard_base=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
 
           configfile="${GITHUB_WORKSPACE}/miryoku/config.h"
           echo '// Copyright 2021 Manna Harbour\n// https://github.com/manna-harbour/miryoku' > "$configfile"
@@ -78,7 +79,7 @@ jobs:
 
           if [ -n "${{ matrix.kconfig }}" -a "${{ matrix.kconfig }}" != 'default' ]
           then
-            kconfig_file="config/$keyboard.conf"
+            kconfig_file="config/$keyboard_split.conf"
             echo "${{ matrix.kconfig }}" > "$kconfig_file"
             cat "$kconfig_file"
             cp "$kconfig_file" "$artifacts_dir"
@@ -88,13 +89,13 @@ jobs:
           outboard_dir=".github/workflows/outboards"
           if [ -n "$shield" ]
           then
-            outboard_file="$outboard_dir/$keyboard.shield.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.shield.outboard"
           else
-            outboard_file="$outboard_dir/$keyboard.board.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.board.outboard"
           fi
           if [ ! -f "$outboard_file" ]
           then
-            outboard_file="$outboard_dir/$keyboard.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.outboard"
           fi
           if [ -f "$outboard_file" ]
           then
diff --git a/.github/workflows/test-build.yml b/.github/workflows/test-build.yml
index a2484cc..1b2566d 100644
--- a/.github/workflows/test-build.yml
+++ b/.github/workflows/test-build.yml
@@ -50,7 +50,8 @@ jobs:
             shield=""
           fi
           echo "::set-output name=shield-arg::${SHIELD_ARG}"
-          keyboard=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
+          keyboard_split="$keyboard"
+          keyboard_base=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
 
           configfile="${GITHUB_WORKSPACE}/miryoku/config.h"
           echo '// Copyright 2021 Manna Harbour\n// https://github.com/manna-harbour/miryoku' > "$configfile"
@@ -76,7 +77,7 @@ jobs:
 
           if [ -n "${{ matrix.kconfig }}" -a "${{ matrix.kconfig }}" != 'default' ]
           then
-            kconfig_file="config/$keyboard.conf"
+            kconfig_file="config/$keyboard_split.conf"
             echo "${{ matrix.kconfig }}" > "$kconfig_file"
             cat "$kconfig_file"
             cp "$kconfig_file" "$artifacts_dir"
@@ -86,13 +87,13 @@ jobs:
           outboard_dir=".github/workflows/outboards"
           if [ -n "$shield" ]
           then
-            outboard_file="$outboard_dir/$keyboard.shield.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.shield.outboard"
           else
-            outboard_file="$outboard_dir/$keyboard.board.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.board.outboard"
           fi
           if [ ! -f "$outboard_file" ]
           then
-            outboard_file="$outboard_dir/$keyboard.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.outboard"
           fi
           if [ -f "$outboard_file" ]
           then
diff --git a/.github/workflows/test-configs.yml b/.github/workflows/test-configs.yml
index a185c4e..6f909ba 100644
--- a/.github/workflows/test-configs.yml
+++ b/.github/workflows/test-configs.yml
@@ -57,7 +57,8 @@ jobs:
             shield=""
           fi
           echo "::set-output name=shield-arg::${SHIELD_ARG}"
-          keyboard=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
+          keyboard_split="$keyboard"
+          keyboard_base=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
 
           configfile="${GITHUB_WORKSPACE}/miryoku/config.h"
           echo '// Copyright 2021 Manna Harbour\n// https://github.com/manna-harbour/miryoku' > "$configfile"
@@ -83,7 +84,7 @@ jobs:
 
           if [ -n "${{ matrix.kconfig }}" -a "${{ matrix.kconfig }}" != 'default' ]
           then
-            kconfig_file="config/$keyboard.conf"
+            kconfig_file="config/$keyboard_split.conf"
             echo "${{ matrix.kconfig }}" > "$kconfig_file"
             cat "$kconfig_file"
             cp "$kconfig_file" "$artifacts_dir"
@@ -93,13 +94,13 @@ jobs:
           outboard_dir=".github/workflows/outboards"
           if [ -n "$shield" ]
           then
-            outboard_file="$outboard_dir/$keyboard.shield.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.shield.outboard"
           else
-            outboard_file="$outboard_dir/$keyboard.board.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.board.outboard"
           fi
           if [ ! -f "$outboard_file" ]
           then
-            outboard_file="$outboard_dir/$keyboard.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.outboard"
           fi
           if [ -f "$outboard_file" ]
           then
diff --git a/.github/workflows/test-controllers.yml b/.github/workflows/test-controllers.yml
index 642636e..d5952cb 100644
--- a/.github/workflows/test-controllers.yml
+++ b/.github/workflows/test-controllers.yml
@@ -50,7 +50,8 @@ jobs:
             shield=""
           fi
           echo "::set-output name=shield-arg::${SHIELD_ARG}"
-          keyboard=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
+          keyboard_split="$keyboard"
+          keyboard_base=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
 
           configfile="${GITHUB_WORKSPACE}/miryoku/config.h"
           echo '// Copyright 2021 Manna Harbour\n// https://github.com/manna-harbour/miryoku' > "$configfile"
@@ -76,7 +77,7 @@ jobs:
 
           if [ -n "${{ matrix.kconfig }}" -a "${{ matrix.kconfig }}" != 'default' ]
           then
-            kconfig_file="config/$keyboard.conf"
+            kconfig_file="config/$keyboard_split.conf"
             echo "${{ matrix.kconfig }}" > "$kconfig_file"
             cat "$kconfig_file"
             cp "$kconfig_file" "$artifacts_dir"
@@ -86,13 +87,13 @@ jobs:
           outboard_dir=".github/workflows/outboards"
           if [ -n "$shield" ]
           then
-            outboard_file="$outboard_dir/$keyboard.shield.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.shield.outboard"
           else
-            outboard_file="$outboard_dir/$keyboard.board.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.board.outboard"
           fi
           if [ ! -f "$outboard_file" ]
           then
-            outboard_file="$outboard_dir/$keyboard.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.outboard"
           fi
           if [ -f "$outboard_file" ]
           then
diff --git a/.github/workflows/test-shields.yml b/.github/workflows/test-shields.yml
index deed7e5..00aadc0 100644
--- a/.github/workflows/test-shields.yml
+++ b/.github/workflows/test-shields.yml
@@ -102,7 +102,8 @@ jobs:
             shield=""
           fi
           echo "::set-output name=shield-arg::${SHIELD_ARG}"
-          keyboard=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
+          keyboard_split="$keyboard"
+          keyboard_base=`echo "$keyboard" | sed 's/_\(left\|right\)//'`
 
           configfile="${GITHUB_WORKSPACE}/miryoku/config.h"
           echo '// Copyright 2021 Manna Harbour\n// https://github.com/manna-harbour/miryoku' > "$configfile"
@@ -128,7 +129,7 @@ jobs:
 
           if [ -n "${{ matrix.kconfig }}" -a "${{ matrix.kconfig }}" != 'default' ]
           then
-            kconfig_file="config/$keyboard.conf"
+            kconfig_file="config/$keyboard_split.conf"
             echo "${{ matrix.kconfig }}" > "$kconfig_file"
             cat "$kconfig_file"
             cp "$kconfig_file" "$artifacts_dir"
@@ -138,13 +139,13 @@ jobs:
           outboard_dir=".github/workflows/outboards"
           if [ -n "$shield" ]
           then
-            outboard_file="$outboard_dir/$keyboard.shield.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.shield.outboard"
           else
-            outboard_file="$outboard_dir/$keyboard.board.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.board.outboard"
           fi
           if [ ! -f "$outboard_file" ]
           then
-            outboard_file="$outboard_dir/$keyboard.outboard"
+            outboard_file="$outboard_dir/$keyboard_base.outboard"
           fi
           if [ -f "$outboard_file" ]
           then