I made a video demo, it only has a few chords and one 4 bar section for each. You can add a lot more to give more variety rather than playing the same 4 bar chord section.
The video is a bit jerky in places as there are a lot of things running and screen recording at the same time. It will play smoothly from chord to chord normally. The clicking is the chord pad as I have no keyboards here at the moment, so if someone could try it with their keyboard that would help.
It will also play direct from the BB Plugin without dragging any tracks in Reaper. You could have a BB Plugin on each track with a different style at a different bpm.

Watch Demo Video BB Tracks Chord Player

Biab Track Injector for Reaper
Free Biab Chord Picker Tool