I don’t have an answer for your specific question (you can easily find out testing such a scenario on docker on your personal computer), but you should look into bazzite and use either brew or if you feel adventurous enough use package layering to add fish to the image.
I hope so. I really want Valve to allow Android games on to their store and allow installation from it etc. I’d trust Valve way more than Google, thus I’d be way more inclined to buy Android games.