Under advanced you can enable swipe to change language. Then you can swipe up from space to cycle through your languages. I find it quick enough. No idea about gifs but holding return you can insert emojis.

For me cattpuccin also works with libadwaita apps if you symlink the config in gtk-4.0 folder of the theme to .config/gtk-4.0 or is it something more than the colors you are missing for libadwaita apps? 🙈