Here's a video using the chord track in Reaper to drive these Virtual Instruments. The fist track is the midi chord track with midi sends to the virtual instrument tracks, if "Chord Track Send to Virtual Instrument" is implemented it would work the same way in Biab by sending the BB Chord Output chords to the virtual instrument track rather than having to export it then import it, then all you need to add are your keyswitches.
Also if we had DROP Import of MIDI we could drop the RealGuitar midi phrases directly into the Piano Roll (Drag n Drop Audio into the Audio Edit is now implemented and in 714 you can drop from the Biab Plugin in to the Audio track allowing you to bar by bar regeneration, though the vst sync issue still needs fixing).

https://www.youtube.com/watch?v=OKFQ0c2K1Ss