It's not just a case of lower keys and pedals.
I played organs in Pubs and Clubs for years and I have yet to hear an organ on ANY arranger which sounds as convincing as those I used to play and they were not all top of range organs.
Fitting a Lester K or similar Stereo Rotary Box does a lot to improve them but, without one, even my Genos falls far short of a convincing organ.
D-Deck sounds ok and I might have considered a D-Deck if they were sold here but would need to audition one first.