You should be able to gently cut them with a razor and then glue them to a rock. Remember to use the gel-based super glue, not liquid.
We just moved (not fragged) some polyps from their frag-plug thing over to a rock. We scraped them off with a straight razor, took them out of the water
briefly to apply the glue, then put them back in the water and placed them on the rock - pushing gently until they were secure.
Accidentally got glue on top of one of the polyps somehow
Oops. All the others opened up almost immediately though.
Kara