I only had a quick look at these, but:
How would you work it in ? All the realtracks so far are recorded normal chords.
What format would these be entered in the chord sheet, with a D-CMaj7 D-Ab-G ?
How would the other instruments without polychords read them ?
How many polychords would you need to record along with the other chords in a realtrack ?
Maybe use midi that can duplicate the notes of one chord being played in the recorded material and fit them into the other omitting existing, and have another chord sheet layer for these chords ?????
Have you tried this with a MidiSuperTrack ?