The way to get a custom load screen locked in on the Steam Deck is to ensure your video is a webm file in 1200 x 1800 ...
He Chunhui (hchunhui) has developed the Tiny386 x86 PC emulator in C (C99) and managed to run Windows 3.1/3.2 and Windows 95 ...
If you want to play the game, you'll need to play by the rules.
If Windows Update says your computer doesn't meet the Windows 11 requirements, you might just need to tweak some settings.