/cgl/ - Cosplay & EGL

I'm looking to make some flapping dragon wings to cosplay pic related, and I have a couple of ideas. My first idea is a puppet cable (like the ones they use in those shoulder puppets) with the wings attached to it. My other idea is to take the mouth mechanism out of one of those singing trout things, and attach one wing to each end of the mouth, so it flaps automatically and I don't have to manually work it.
Which do you guys think would work better, and if a puppet cable would work best, where can I buy one?