Actually, here's what I would do if I were you:

1) start your project in BIAB. Demo many styles against your chords, and when you find a style you like save the project

2) open the same saved project in RealBand. Assign the MIDI tracks to GPO


by starting in BIAB you get the benefit of working with styles that contain tracks that work together very well. You don't have to search for something that works. You know right away what the song will sound like.

But when you open it in RB and assign the MIDI to GPO, it will sound a lot better than it did when you demoed it using coyote wavetable soft synth in BIAB

https://www.dropbox.com/sh/ey71h8ep047758h/AAC12jNM0Hz9Q8zsh5iDeqNHa?dl=0