I haven't tried but it seems like you could use a keybinding daemon to effectively remap any application by changing layer in response to window focus changes.

I haven't tried but it seems like you could use a keybinding daemon to effectively remap any application by changing layer in response to window focus changes. See Ktrl + alt or Kmonad https://github.com/ItayGarin/ktrl https://github.com/ItayGarin/ktrl https://github.com/ItayGarin/alt https://github.com/ItayGarin/alt https://github.com/kmonad/kmonad https://github.com/kmonad/kmonad KDE apps are also universally very remappable