Another idea would be switching the VM to Wayland and then use render offload with Xwayland. Don’t know whether this works at all but worth a shot.
How should I configure bhyve if I want to try xwayland or VirtualGL with PRO ? Which gpus should I pass ? what will play the role of the framebuffer ? Can you suggest some documentation about how to configure the linux VM to try xwayland and PRO ? It seems a nightmare to make it work. Thanks.