The host is headless, no video output. The 2 VMs have a GPU passed directly through vfio, so there is no additional delay. Both GPUs connect to the same 2 monitors and USB by a KVM, so its one button press to flip between systems. Though I often run the cad software over RDP, as a little extra latency when using that doesn’t bother me.
Lol was pretty much my first thought.