Greetings. So after retrying to get pci passthrough working, I was half successful. I got it to finally show up in device manager after following the guide at https://mathiashueber.com/pci-passth…rtual-machine/
For hardware accelerated VMs looking glass is indeed the way to go. But before installing that I would make sure it works. Detatch Spice and the video device and attach a monitor to the graphics card. Start the VM and check that you get proper video output on the guest and if you can install the necessary drivers.