Printing Clear Glass Christmas Bulbs on a Mutoh 661 with a rotary.

I was talking with one of my favorite clients, and he likes things that are a little out of the ordinary. When I told him I was getting a Mutoh 661 UV printer, he was pleased, indeed. But then, he did go on to ask if I could print planets onto glass Christmas bulbs. It's a good question, as I have only had this printer for over six months. How do you think I should go about doing this? In the video, I make the bulb load and unload to even out the sand that I filled them with. No sand, and they didn't move.