[williamcotton]

You can get MIDI keyboard with 88 weighted keys.

Also, there are plenty of electric pianos, like the Wurlitzer or Rhodes, that have leas than 88 and only semi-weighted keys.

[solresol]

You can also get midi interfaces for cathedral organs; letting you use the organ console to control midi devices, and also letting midi devices control the pipe relays in the pipe organ.

Of course, whether you would want to use the OP's app in some giant cathedral is another question.

[williamcotton]

I had a Roland MIDI pedal keyboard for awhile, although not for organ music, but for accompanying guitar.