Well- I don’t totally get it.. but I tried some things out.
You can ALMOST get there with a DMC3. I can get it to flip from Major to HUNGARIAN within a preset with one touch. But not Major to minor.
If you have a more finely programmable midi switch you could do it.. the DMC just doesnt have that fine level of detail. I can do it with my Arturia midi controller…, it just isnt a footswitch.
You just need to be able to send a MIDI CC and define the value freely from 0-127. I am sure that there are MIDI controllers that totally do this.. I just don’t know which off the top of my head.
–though, I promise you, using separate patches would be easy and transparent 😉