the safest fastest but expensive way, get a second drive that’s big enough to run windows and your game. disable the drive from BIOS boot options and add an entry to your bootloader. i salvaged an old 512gb sata to do this for firmware/some legal document things that only work on Windows.

there’s vfio but i believe you still need two video cards to get that working, one for the host one for the vm.

just never trust windows on your main boot drive that only leads to you having to recover your bootloader when a windows update replaces it. and this is not a question of if they will it is a question of when.

it’s one of those things that people need to ask about things they are an expert at so they can understand how valuable the results really are.