I’ve been doing this for years in various setups. Windows, Linux, Mac (Mac using different shortcuts), different nice, different keyboards. It’s kind of up to you and how much that stuff messes with you. Current, long term setup, is ergonomic keyboard (Microsoft) on a MacBook pro. My hands distinguish keyboards well. Every now and again I don’t myself hiring the wrong shortcuts. Part of that is using the same keyboard on Mac and Linux though

Stick with it. You get used to it, and ergonomics are absolutely worth the investment

Arch seems like it would probably be one of the best distros to pick for gaming because of Valve’s use and support of it for the Steam Deck. I can’t answer the specific question