Have you thought of creating the track in BIAB, regardless of the drums the style uses, then going over to RB. Import the file into RB, mute the unwanted BIAB track drum track and then you can create exactly the drum track you want with the drum grid editor. It's midi but i find midi drums fine in a mix. And you can fill as many bars as you like so the input of the drums into the drum grid editor is not as time consuming as you might think. You save the drum pattern as a dg file. Whether you can import a dg file into BIAB I don't know but it would be a neat trick if you can!