Why not use MIDI? Have BIAB generate a MIDI bass line, modify it to your needs, then use a bass from Kontakt.

OR create a RT bass track, save it, use a pitch to MIDI program (Melodyne is one of the best but there are some free ones out there), change the part(s) you would like to change then pick a Kontakt bass sound.

Just my thoughts.

PS-I have used the RT suggestion with no problem.

When you are at the checkout line and they ask if you found everything say "Why, are you hiding stuff?"

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware