I’ve engraved bone with good success:
As you can see, it took me a few tries to get the settings dialed in. I see that I did not update that thread when I did the last batch, but they came out nicely. I’d have to dig around for the settings that I used - and it might be a moot point, since the PRU was a bit different than the production models.
But yeah - all that to say that it can be done, with good results. Might have to play around a bit with settings though. How will you get around the height issue, or are you planning to slice it?