I was under the impression that the Kurz KB3 was a good enough organ clone for a rompler anyway.
It's better than a rompler organ. It's just not as good as what's in the Roland VR09/VR730. Comparing it to boards that only do sample playback (modern versions of what used to be called rompelrs) is different from comparing it to boards that actual have separate organ engines that reproduce sound using different technology than just playing samples.
I should also point out that its organ can be improved externally more easily than the Roland's.
... If you want to get a better Leslie effect, the Kurzweil lets you pan the organ to one side and all your other sounds to the other, so you can put an external pedal (like a Lester K or a Neo Ventilator) on the organ sound and it will work well. On the Roland, you can't pan the organ to one side, so if you want a better rotary effect, unlike on the Kurzweil, it will be impossible to put the better Leslie effect on the organ without also putting it on any sound you may be splitting your organ with. Also, because you can't separate the outputs on the Roland, you'd have to switch the pedal in and out every time you changed sounds (otherwise you'll end up with Leslie on your strongs, brass, whatever), whereas on the Kurzweil you can just leave it engaged and forget about it, and it will work fine.
... If you want to control an external organ source for a better organ (like a Gemini module, an iPad organ like B-3X or VB-3m, or a VST), the Kurzweil does it easily because its sliders can send standard MIDI CC. The Roland's drawbars send sysex, so you would need an external app or device to convert the systex to CC in order to do this.
Incidentally, I love the new
Yamaha YC 73 BUT HATE THAT AWFUL FAST LESLIE SIM.
and the Yamaha has the same issue as the Roland, where even if you want to put a Leslie pedal on it to improve it, you can't send it your organ sound without sending it any other sound you may be playing with it, and without having to switch the pedal in or out every time you change between organ and non-organ sounds.
FWIW, I bought-and-returned Roland VR-09 and Yamaha YC61. I kept the Kurzweil Artis 7.