You can isolate Windows in a VM.😂
I do this to play some video games. I have a GPU passthrough to the VM and remote /stream play at 4k@75 fps on my laptop with a total input lag added of about only ~30ms.
Discussion
I don't play games often, and even if I really wanted to play a Windows game, I probably wouldn't mind hacking together some kind of Wine configuration that allows it to run on Linux. Or dropping the game if I can't.
In other words I don't care at all about performance or latency. I'm also not opposed to running Windows in a VM. I just want to find a way to pay with money instead of my soul. In other words, I don't want to make a Microsoft account, I don't want to run a pirated version of Windows, and I don't want to try to scam Microsoft or lie to them on some random form they make me fill out before I'm allowed to download an ISO.
I'm not sure what all the options that are available are in the current day.
If you choose to go the VM way, I find proxmox to be pretty nice.
You should be able to buy an official Windows 11 key without a Microsoft account and you also should be able to run it with a local account. You will need to either run a command line during the setup to skip the account creation or use an answer file.
Also downloading the Windows iso does not require a Microsoft account.
Also for the gaming part, I tried Wine and Cross Over but it has compatibility problems since it try to translate some functionallities and it may not always translate everything.
I find the gpu passthrough to a Windows VM to be way more stable. Dual boot is also an option, but I like the fact that I can access the VM at anytime at lightning speed, and I can also host other services on the same computer at the same time in other Linux VM.