As mentioned in Rusty's post, here's a way you can do it below.
For Plugin 1 you insert a region in Reaper for 4 bars called Intro, Verse 1 8 bars, Chorus 1 8 bars, etc..
In the Region Manger window you can select any song section and it will zoom that section to fit the timeline, select that track and open only that section BB Plugin with chords.
You can create a GUI to get it to do whatever you like.
You don't have to wish for this, you can do it today.