Running Windows is officially supported by Apple, yes most guides use bootcamp to set it up, but you should be able to create an install drive like a normal PC and boot from it by holding Option/Alt as you press the power button. Mac’s usually just use EFI like any modern PC under the hood.

Nah, bootcamp assistant is Apple’s dual boot setup tool, it is a native install, but it has to be started from MacOS.

Probably because there’s also permission to use the X11 socket.

I think you’d have to modify the edid, since you’re setting a custom refresh rate, not a hidden one.

I’ve use wxEDID to force enable VRR before.

Well, aren’t you glad they’re removing go-git then!