What I did was completely kill my live rocks by letting them dry and reseeding them with live rock rubble(extremely small pieces). Only way I know how to get a 100% bristleworm-free tank.
EDIT: Do this separate from your tank! Forgot to mention this.
Collect them all and offer them to the members on MR. I'm sure LOTS of people will gladly take them off your hands. They are a good part of your ecosystem.