Have you tried something like xpadder where it just maps the keyboard keys used in the game to your controller buttons? I’ve had to use that from time to time way back with older games before controller support got better. Not ideal, but seems to work usually when all else fails.
I’m not sure if/how it works exactly since I mostly do my “PC” gaming on Steam Deck these days, but if it’s possible to use Steam Input on Windows, you may be able to do something similar right in Steam.