Yeah i just edited my comment, i think the nonguix kernel might actually allow you more finegrained control over which firmwares you want to load. I’ll have to experiment with that a bit.

Edit: can now confirm that removing linux-firmware from my config and only keeping amdgpu-firmware in it only loads the gpu firmware. Could easily tell because my wifi card on my desktop needs firmware, and it stopped working afterwards (i’ll probably try to find the specific wifi firmware as well, but not a priority cause i pretty much never use wifi on desktop).