Noel, Videotrack, Mario
Thank you for your replies!

Mario, I was thinking about what Jim said a few posts above and your idea of A/B switch.
It seems Jim's idea is more universal.
If lets say one more "universal" independent midi track is opened on the mixer that can host entire VST without "stealing" channels, that should solve A/B switch, but in a different way. Because in theory, you should be able to use your VST as an independent mixer and have as many channels as you wish, layering styles etc and they would not interfere with 7 channels that are internal to BIAB.

To make this happen, in my opinion, does not require much. As it is all there, but not logical. BIAB renders tracks from VST + BIAB, so even that is solved...

Or am I missing something?

P.S. I wish people who are interested in this would come to a consensus of something universal for different tasks and appeal to Peter Gannon directly with a worked out, balanced solution. A joined, detailed proposal / request from full time loyal supporters.