It would be cool to see and compare Marco playing a TRX type setup compared to the organ...Wish there were more demos of the TRX approach by great players.
Anyways.... this is an arranger forum, so I am more interest in what we can do from that approach.
I would have liked to see this to. I think it's much worse functionallity but perhaps possible to work with.
I heard people before, with Tyros, using R3 for the bass pedals leaving only 3 Real time parts and there seems to have been some remarks for suitalbe vocies for bass pedaling, perhaps to some extent to lower also.
One Cumberstone is that it't not possible to get the manuals in the correct distance from each other. If casing is removed from lower it's probalby withing ok.
For Yamaha there are limited numbers of keyboards that could be used since Yamaha uses narrower key width for synth keys than the standard 165mm per octave and you really want the keys to line up of organ playing.
The choice now most often seem to be NP-32 that doesn't have a midi connecter but only USB midi.
Before M-audio keystation 61 have been used in several cases but since mk3 it has the standars key width and is therefor no longer suatible as lower for Yamaha.
These are both lower quality keybeds withouth after touch. For any quality keybed with after touch I don't know.
I have been thinking of this option myself since organ market is dead. If you go ahead reports will be very interesting.
There are also a couple of advantages as more keys especially compared to the 2x49 option.
It is also possible to sell the instrument when wanting something else wich will be very difficult with an organ.
And in case of Genos or Yamaha in general there are a sample player and you can import new sounds.
How well the keyboard styles operates in organ playing I don't know. Often I guess you would only want to use the drum track.
Cost with a Genos will be about 5.5k Euro, maybe could even be somewhat lower, (Viscount has cheap pedals for arround 1200-1300 Euro and up depending on 25 pedals or up to 32, I think they even has a set of 20 that is probably slighlty cheaper) and the cost for building a stand and amplifying.