I remember doing that, but I did it in the DAW with 2 tracks with different guitars and used the volume automation lanes to reverse on the other track. I tried to get that in Biab but it's not there yet frown
You can also make up a UserTrack of the two or more RealTracks playing.
You can also do with electric Direct Input guitars, just use the same FX for both.
Maybe you could get Biab to intelligently mix the tracks chosen tracks while generating.