So you want to control other synths from Summit, Prophet, Polybrute or whatever knobby master keyboard you have.
If you know how to do the routing, midi channels, local on/off, then the only remaining and possibly the worst obstacle is the actual remapping of the MIDI CCs.
Well, no more, ChatGPT & MIDI.GUIDE database for rescue.
Enjoy and kudos to all contributors to the aforementioned projects.
EDIT: I will do some fine tuning and submit the prompts later.