Hello,
I have been thinking of unusual sample sets to add to a theatre organ (in most cases), because they have less contained "rules" compared to classical/orchestral pipe organs. I really like the Hand Bell idea that engrssc brought up. That could be a great voice to add as a percussion solo voice.
My thought is on the odd side and I am not sure how it would be achieved with a static note system, when this instrument is extremely portamento and the way it operates and how you get vibrato and other effects would be very difficult to implement in a fixed key situation. I could see it as a solo stop, but almost more on a modern digital orchestra type instrument where it uses all samples of real instruments, verses an instrument that does use samples, but of a single instrument (the pipe organ). There are plenty of sampled voices for just about anything now, but adding them to a "standard"...at least to a degree, would be difficult. Here is an example of what I am speaking of. It is a Theremin and played with an orchestra backing.
https://www.youtube.com/watch?v=lY7sXKGZl2w&fbclid=IwAR1alJ83cfOaM75gdxxkI9js6nJa6vAR8BphIbzA5F_biBmmRp-iEw4x5hU Before anyone dismisses this as "crazy", just imagine it as a solo stop that is different that any other (at least that I can think of. Thank you, Steven