I used to dream about this, but instead I added the reface YC on top of my CP88.
Just to make up for “the lack” of usable organ voices on the CP. I don’t really need another keybed (waterfall) for now; I play the YC’s voices through midi on the CP’s keys, so I have 4 voices in total at my disposal.
And I really love ALL the reface voices, including the discontinued “vintage” YC organ. The drawbar-sliders are of course not the same as on the YC-61/73/88, but I think they work really nice.