I made this in the GUI Builder (a save session in GUI Builder would be good) it's just frames, just not sure how to correspond it to the region list, it needs to be able to show a chord on each beat if needed, and the frames only have one text: text = "",
There is Get Inputs I could use to edit the region names but I think the normal region edit is best.
I can still enter chords from the other main GUI and the Circle of Fifths radial menu.
Color sections can be added/change with the main GUI also.