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Chipping in from some experience with my setup.

netgraph networking works very well with bhyve.

I use the following script to setup a bridge to link the virtual machine directly to the OPNSense LAN interface:

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# Setup ng_bridge if required
if ! ngctl status bnet0: >/dev/null 2>&1; then
  ngctl -f- <<END
    mkpeer igc0: bridge lower link0
    name igc0:lower bnet0
    connect igc0: bnet0: upper link1
    msg igc0: setpromisc 1
    msg igc0: setautosrc 0
END
fi

This creates a bridge linked to igc0 (my OPNsense LAN interface) and prepares for bhyve to attach.

bhyve can subsequently attach to the bridge as follows:

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bhyve \
-c sockets=1,cores=8,threads=1 \
-m 16G \
-s 0,hostbridge \
-s 2,virtio-blk,/vm/hdd.img \
-s 3,virtio-net,netgraph,path=bnet0:,peerhook=link2 \
-s 4,virtio-9p,data=/zdata/vm \
-s 5,virtio-rnd \
-s 31,lpc \
-l bootrom,/vm/BHYVE_UEFI.fd,/vm/efi-vars.fd \
-l com1,stdio \
-u \
-H -P -S \

This has provided very stable and performant networking on the bhyve instance.