BB would need to provide midi out with channel assignments in order to accomplish this task. I don't know if BB can do that, but someone who does will be along shortly with the correct answer.

If it doesn't provide midi out in that format..... you could simply drag the midi tracks and the real tracks into a DAW that does do midi out (most do) and use that platform to do what you want.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.