Do peyote stich for the back, a little larger than the bead.
Then do a frame peyote stich for the front and "Zip" them together.
After about a dozen trials, I am hoping this is works.
My other other thought is to glue the Cabacho I have made to suede or felt and stitch around it. I have done this before.
I am still not done with the piece. With all the stitching a bead broke, so I have a hole that I sort of fixed.... You can see my work place...lots of beads...!!! I like lots of beads... It's like search for a treasure.