I just wouldnt do it.
Unless you thouroughly torched the whole thing for a couple seconds there is no way you could get all of them. Even then, being familiar with the things, I wouldnt bet against a comeback. Of everything that is on your live rock, they are probably the most durable.
I wouldnt put a torch to my rock unless there was nothing I liked growing on it. My rock is covered with macros, worms, and other little plants and animals. I wouldnt use this method unless I needed to, and thought that I actually could eradicate EVERYTHING-with 100% certainty.