If you use steam, this project https://github.com/luxtorpeda-dev/luxtorpeda, converts proprietary engines to use opensource versions when available. Here: https://luxtorpeda-dev.github.io is a list of games supported by this. How to use Luxtorpeda on Steamdeck: https://www.gamingonlinux.com/2022/03/steam-deck-using-luxtorpeda-for-morrowind-warzone-2100-and-x-com/
Really? Is available here in Brazil