Ha! Received my new gaming rig, installed Fedora and was immediately thankful for past me documenting kernel module signing: https://janhendrikpeters.de/en/post/obs-virtual-camera-secure-boot/
At that time to sign the v4l2 module, but today the old post helped me once again in signing the Nvidia modules. For some reason - which I did not care to troubleshoot longer than necessary - the documented akmods procedure did not work. Or rather: Did not sign the modules with the enrolled key.