I was successful to repurpose the midi channel variable "L" to control one of the 26 individual drums in JD-XI via SysEx , so one set of controls (60-100) with one Super control and two hidden ones can repurpose the 60 controls to one of the 26 drums. Thus having 26x60 controls on ONE PAGE. Well 60 + 1 controls. The same concept can be adapted to partials which rolland has a lot. So you'd need to ceate Layout for ONLY one partial and then have a selector (super control) that will choose with partial to edit.
So I really don't care which letter of alphabet you'd use M or P but we'd have one page for multiple midi channels and multiple partials, Somehow this could be applied to LFOs, ADSRs with more than 2.
Since I sense that Dan might implement SysEx feedback (get state from a device) this could complicate the implementation but the same applies to request as soon as selector changes it would trigger Sysex request state so that controls would set values from device properly.