You could cut a larger frozen thawed mouse open, and stuff a few smaller ones inside, and sew it closed with a single knot of white cotton thread, the snake will just pass the cotton with the rest of the mouse fur with his next bowel movement... You know make your snake a double mouse burrito, lol...
Does this make me sound like a sick individual?
At the reptile shelter where I volunteer we do this with large rats, we sew them head to butt, 4 rats long and then feed them to our King Cobra, in the wild they are snake eaters, and this ensures that he gets a decent sized meal when he takes a rat. The thread does not hurt him, he just gives it back to us a little while later...