Yeah the thing is that bhyve doesn't seem to have an emulated console like the other virtualization solutions out there. That makes things a little more cumbersome.
I'm not even talking about 3D passthrough. Just a fake VGA adapter you can see in a window so you can run an installer.
It provides a graphical console over VNC:
https://github.com/churchers/vm-bhyve/wiki/UEFI-Graphics-(VN...
You can pass though hardware devices including graphic cards but you need to have it as a secondary and unused. bHyve is unable to use the primary card as well as a shared device for the guest.