In the past I have used EZDrummer with BIAB. I would put together my BIAB tracks, both MIDI and RT and RD, and export. In my DAW I would import these tracks and set the correct tempo. Then I would open EZDrummer, mute the BIAB drum track, and audition drum parts. I would construct the drum track using basic groove, variations, fills, intros and endings from EZDrummer. Then I would render the drum track to audio--either a stereo track, or multiple tracks (kick, snare, toms, hi-hats, cymbals, rooom, and overheads) for more controlled mixing.

Once you find a groove that fits the BIAB tracks things should go pretty fast in EZDrummer.

BTW, the new Americana EZDrummer is fantastic.

Fred Grittner
2020 iMac, Sequoia 15.5, Logic Pro
https://fredgrittner.bandcamp.com