Ev, you've hit a long-standing omission from many "normal" keyboards, namely it isn't possible to store "external" patch selections easily with "Internal" ones.

This type of facility is normally associated with "master" keyboards, in that a single patch on a master keyboard usually configures keyboard splits, layers, midi channels and external sound modules all in one go. Having this capability as part of the "registration" system on my PSR2k would be marvellous! I have this on my older Ensoniq SD1 but it is seriously limited because it doesn't understand Bank Changes in the modern sense.

Another method (and I don't know much about this so I might be talking rubbish) could be to use a midi controller box (Peavey 1600?) and storing patch changes in presets against the control buttons?