I honestly vastly prefer using IDA and Windows specific tools (x64dbg) over gdb. IDA can interface with gdb so it can act as a frontend which can be handy for visualization.

Not a bad idea actually, totally didn't think about that.

Maybe even a PCIe pass through to a VM could do the trick if you're desparate lol (with Linux living in a separate drive)

Orrrr maybe even try FreeBSD... (or mac OS, but eww gross don't test that)

Well, Cross Duel was something completely unique and was more like an RPG than the regular game.

I don't think that's gonna work because this is a thing that he needs

https://github.com/elFarto/nvidia-vaapi-driver

Basically yep. That's my best guess as well.

Probably a misplaced apostrophe, as is common with most people online. Same with "it's" (short of "it is") and "its" (possessive).