Hmm, from what I've seen they're mean little buggers, but I'm not sure how everything would work out if you dropped them into the clownfish's territory.
Have you seen the fish for yourself, or watched them for a bit? Every time I've ever seen two together, one was giving the other hell. But I've heard that damsels may pair off sometimes, so if that's the case that may lead to some conflicts as well...
::edit:: Also, don't "ditch" them if you don't want them. Stick the words "free" and "fish" together and you're bound to have takers