I did some more experimenting, and I can get a pretty good import if I export the ring and both dots from XaraX as .wmf file! If I import the wmf, Xara3D interprets the sizes a little differently, so I needed to tweak the aspect ratio and object sizing a little, to get it to fit the rest of the sphere. I'm off to try the method on the other shapes I wanted to engrave!

Mike