I looked into midiflow and talked to the designer by e-mail. His product has a lot of the right attributes for the job, i.e. it zones, remaps controllers, allows you to select a new zone map via a received midi patch change, you can renumber the zone map midi patch number (allows you to rearrange the set list and just step upward as the band goes through the set) and so forth.
What it presently lacks is the ability to send any kind of setup information to the synth modules being controlled.
So he's only about 2/3 there right now.