It should be pointed out: deblobbing a kernel does not necessarily harden it. Secure and libre are orthogonal concepts. That being said, I like your idea.

All of EA’s new titles use Javelin anti-cheat. It uses a Windows kernel module, so it’s not possible to run with Wine/Proton.

Given that EA forces users to run what is effectively a rootkit just to play their games, I feel like the only good choice is to stop playing those games altogether. Or, at the very least, compartmentalize your gaming machine and the network it’s on.