I made a small modification to Celluloid’s snapcraft.yaml made by sameersharma2006, to generate a version of Celluloid before GTK4 and libadwaita.
I released it on Snapcraft under the name Celluloid Twin, I did this for those who want to use Celluloid, but don’t like the libadwaita look, as well as to generate design consistency with the theme the user is currently using.