OK, now I'm looking into using UserTracks to automate this process, at least for chord progressions:

1) BIAB: Export UserTrack template yadayadayada.sgu to MIDI
2) Logic: Import MIDI, invert, render to audio
3) BIAB: Use inverted audio file for UserTrack audio file yadayadayada.wav

========

TEST RESULTS SO FAR:

Tracky McTrackface, a UserTrack template played with a cheesy MIDI style

https://soundcloud.com/mark_hayes/trackymctrackface

Tracky McTrackface transformed, using inversion UserTrack

https://soundcloud.com/mark_hayes/trackymctrackface-inverted