Powertran Transcendent 2000

Does anyone know where to find the plastic keys for a Powertran Transcendent 2000? There are two white and a black plastic one missing. The original keyboard has a hinge along the back and is marked Brevettato on each key.

I have never come across these keys (except on a Transcendent). We literally go through thousands (probably tens of thousands) of keys each year, and we’ve never had those pop up. I hate to sound pessimistic, but I think you have a challenging search ahead!

If you do come across anything, please share your results! Maybe an obscure organ uses those same keys…?