will it blend?

interception-tools.nix

@@ -0,0 +1,23 @@
+{ config, pkgs, ... }:
+
+{
+  environment.etc = {
+    "interception/dual-function-keys/capslock.yaml".text = ''
+      MAPPINGS:
+        - KEY: KEY_CAPSLOCK
+          TAP: KEY_ESC
+          HOLD: KEY_LEFTCTRL
+    '';
+  };
+
+  services.interception-tools = {
+    enable = true;
+    plugins = [ pkgs.interception-tools-plugins.dual-function-keys ];
+    udevmonConfig = ''
+      - JOB: "${pkgs.interception-tools}/bin/intercept -g $DEVNODE | ${pkgs.interception-tools-plugins.dual-function-keys}/bin/dual-function-keys -c /etc/interception/dual-function-keys/capslock.yaml | ${pkgs.interception-tools}/bin/uinput -d $DEVNODE"
+        DEVICE:
+          EVENTS:
+            EV_KEY: [ KEY_CAPSLOCK ]
+    '';
+  };
+}