Before BIAB got 24 usable tracks, changing "styles" in the middle for a prime venue to create a richer arrangement with "legacy" tracks. However, that method was always a pain in the behind for me. There is a whole bunch of issues that I encountered and too bored to remember.

Since additional tracks were opened, my process changed right away. It's so much easier to find tracks that are usable in current composition than trying to solder another style to it. So... The way I do it, I usually start with a style, swapping RT's to better fit of what I am looking for, adding VSTi or two. Then, as song progresses, I will audition and pick other RT or MIDI tracks for transitions, choruses, solo, ending and use "Bar settings" to mute or unmute certain instruments in various places.

Having a "spare" track, you can place-audition any RT from MTP with your chords, so you know exactly how it sounds with your existing chords. You can enable this by pressing "+" where the preview buttons are and select "Double click (or Space bar) plays Chord sheet (not pre-made demo". That way when you double click on RT in MTP, it will place it right in the arrangement. Super fast and efficient way to audition>place tracks directly to composition.