This is the speed of the BBPlugin now:



If you don't like any sections you can regen them and Send to the same track.
You could also send another instrument to that section if you like.



Hang on, I don't like the FX on that guitar, so I'll swap it for the DI version keeping the same riffs:

Now I edited the RealDrum sections and got the drums exactly how I want them...but, oh no I need Stems...no problem I can get the exact same sections in Stems:

Is this example for real..?

If you have Video RealTracks/Drums you can load them into Reaper:
https://www.pgmusic.com/bbwin.videorealtracks.htm

They are .mp4 Changing Media File Types in Reaper.
If you want to keep original audio track just duplicate the track before changing it to video then turn the volume right down on the video track (not mute).

VST6-Reaper-Video-Tracks.mp4
I bought the Video RealTracks Set 1 (VRT1-I) to create the demo.


So each track was duplicated and the volume turned right down on it.
The "Change selected realtrack source file type.lua" is run on each selected video track using mp4 input.
View > Video will show video window.
You can render to new video.
You can get Biab to render the chord sheet to video and use that with a picture in picture video FX.

I think many aspects of you are beyond BIAB official.
If you design BIAB products, BIAB products will be more popular.