I might be missing your exact request, especially the advanced feature section. But I would suggest assigning one of the lower CC# MSBs (I favor CC#4 for pedal myself). Then use expression for true morphing between A/B.
You could still use CC#27 for A/B hard-switching (or the HotSwitch, if so assigned). I believe expression will override several of the A/B switched positions. Phi, Delta, maybe Shape … the ones that switch at midpoint; no matter what method you’re using.
Some good, clean fun to be had sweeping through the CC#20 values, as well.
