You could just use an AMD GPU on Linux. They've had (more than) competitive open source drivers for a few years now, and they play well with all the modern Linux desktop protocols.

I won't be buying new hardware just to use a currently worse functioning alternative whose increased security is wholly hypothetical.

It is something to keep in mind when you purchase your next card. I'll always choose a smooth experience with mainline drivers over 10% more raw power. (And it's incredible how much AMD GPU driver support has progressed over the last few years, going from the total clusterfuck that is Catalyst to everything just working out-of-the-box.)

Clusterfuck? I just installed nvidia-driver and it sets itself up.

Catalyst is AMD's previous driver: https://wiki.archlinux.org/index.php/AMD_Catalyst

Ah my bad, I mixed up with Nvidia. Thank you.

I don't think so. A driver needs to control a device completely so you can't drive sway with nouveau and game on nvidia.