Deacon,
I am tempted to give +1. Some time ago I also requested a "block" export. However.... This is the thing: Transitions, from bar to bar and chord changes are dependent on PGM algorithm that makes these transitions smooth, and it seems it's not only volume zero crossing. You can trick midi into many types of transitions, but RT's are different. I can see that it's technically possible, but musically it will unlikely to sound realistic (the muscle of BIAB). Likely, it will sound like loop chops, or transitions will not be natural.
Partial regeneration is the key to do this stuff, as it allows to modify sections, without loosing other regeneration(s) on the same track. It remains semi-frozen. So for example, if you want to change a part you will just work on that track's segment and swap out the whole track in DAW.

P.S. Off topic, but have you experimented with Track View selection and Ctrl+F8 partial regen?