>>718258438
yeah this one is pretty easy since its actually a Steam game and not some doujin game you're installing so theres even less steps
Black Souls run out of the box just fine, dont even need to change to gamepad since the game is premapped to keyboard
Download the patch installer from otakuplans, add installer as non-steam game, switch to proton experimental, find the game folder and then patch it.
Alternatively Im pretty sure you can just drag and drop your windows patched version into your steam deck since its just extracting some files