You can source the plastic parts for the microKorg keyboard, with several keys attached in one, from the quite cheap and crappy Akai LPK25 (first edition). Found a broken one, opened it and found out.

The microKorg keys might not be the rarest replacement part in the world, but maybe this helps someone.

I’m not sure if the parts under the keys are compatible, and the Akai has less keys so that might complicate things as well.

The Akai LPK25 itself, it’s really crappy, with only this tiny USB slot on it, which apparently comes off very easily. I found it amongst the trash.

There is an MkII version of the Akai and it looks similar enough but not sure if that still has the exact parts!

Image from Syntaur. Where they cost much more than a used or broken LPK25. But you gotta love Syntaur anyway.