What you are trying to do actually sounds like a good idea. I remember doing something similar a few years back with moderate success. The trick was you can not assign a midi patch to a track in a style which does not initially have midi data assigned to it. So the idea of moving over midi data from a track from a different style sounds like the thing to do.

Then more recently there was a video where new features were apparently added which made this appear like it would be easy-peasy. So I just now spent 20 minutes giving it a go as you indicated. I get the same results - kinda a mess. So there must be another way. If I get a little more time today, I will look for the video and/or type a different approach and see what I can get.
Dan, BIAB2020
"...My goal is not to create backing tracks for my music, but rather to get more of me in my music."