[NixOS] Set custom keyboard modifiers globally

nixos/base.nix

@@ -61,12 +61,10 @@
   hardware.bluetooth.enable = true;
   services.blueman.enable = true;
 
-  # Keyboard/Keymap
-  console.keyMap = "us";
-
   i18n = {
     defaultLocale = "en_US.UTF-8";
   };
+  console.useXkbConfig = true;
 
   # Update timezone automatically
   services.tzupdate.enable = true;
@@ -85,9 +83,34 @@
   hardware.keyboard.zsa.enable = true;
 
   services.xserver = {
-    exportConfiguration = true;
     enable = true;
-    layout = "us";
+
+    xkbOptions = "ctrl:swapcaps";
+    layout = "us+rwin_as_hyper";
+    extraLayouts.hyper = {
+      description = "Right Alt as Hyper key";
+      languages = [ ];
+      symbolsFile = pkgs.writeText "hyper" ''
+        partial modifier_keys
+        xkb_symbols "rwin_as_hyper" {
+          replace key <RWIN> { [ Hyper_R ] };
+          modifier_map Mod3 { <HYPR>, Hyper_L, Hyper_R };
+        };
+
+        partial modifier_keys
+        xkb_symbols "home_as_hyper" {
+          replace key <HOME> { [ Hyper_L ] };
+          modifier_map Mod3 { <HOME>, Hyper_L, Hyper_R };
+        };
+
+        partial modifier_keys
+        xkb_symbols "ralt_as_hyper" {
+          replace key <RALT> { [ Hyper_L, Hyper_L ] };
+	        modifier_map Mod3 { <RALT>, Hyper_L };
+        };
+      '';
+    };
+
     desktopManager = {
       plasma5.enable = true;
     };

nixos/home-manager.nix

@@ -2,11 +2,10 @@
   xsession = {
     enable = true;
     preferStatusNotifierItems = true;
-    importedVariables = [ "GDK_PIXBUF_ICON_LOADER" ];
+    importedVariables = [ "GDK_PIXBUF_ICON_LOADER" "PATH" ];
     profileExtra = ''
       export ROFI_SYSTEMD_TERM="alacritty -e"
       . "$HOME/.lib/login.sh"
-      load_xkb_map.sh
     '';
   };