It is partially designed by https://teenage.engineering of Sweden, they apparently among other things came up with the crank.
It looks like a toy, and kind of plays like one, but it's actually a marvellous piece of gear, very capable musically, and providing a fantastic user experience. There's just nothing else like it out there.
The company itself is very unique. Just look at what they came up with [1] for OP-1 accessories: brick LEGO shafts, a bender, and a crank, like the one for Coda.
You couldn’t find any on reverb dot com?
I wonder whether that's accidental, or an homage.
[1] https://en.wikipedia.org/wiki/Casio_VL-1
[2] https://en.wikipedia.org/wiki/Da_Da_Da
[3] for example about 1:25 into this video: https://www.youtube.com/watch?v=lNYcviXK4rg