Beelsamin,
I have Riken Honeycomb wheels on my Vette and I made custom center caps for them. I was always afraid I would lose one because they just snapped on from the outside and although I have one spare, I really don't want to lose any. I put a piece of masking tape inside the cap with my name and number and hopefully if one ever does come off maybe somebody will find it and give me a call. You might try that with your moons...but with them..they might look pretty beat up if one should happen to fly off. Don't know if you'd want to have it back or not.
