FYI Hydroids are from the Phylum Cnidaria meaning they are a coral not a worm.
If you only have a few on each rock torching sounds pretty easy to me. You don't have to baste the rock in flame killing everything with a tiger torch. You can just zap the individuals with a little butane torch and leave the rest of the rock untouched.
Just like the other pests (aptasia, majano, flatworms, red bugs, bubble algae etc) its a lot easer to deal with them when you first spot them than to wait until they take over. Long term natural control with a fish that eats undesirable coral but not desirable coral sounds pretty unlikely especially in a small tank with territorial fish like a clown and tang.
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