I would just use a heavy gauge wire, putting the loop of the bells directly on the wire. The gauge of wire would be dependent on the size of the loop on the bell. You would need to move the bells so that they lay onto each other as closely as possible. The wire can simply be twisted to form an ear and again to reconnect with the head. It really seems simple, but then again I haven't tried it, I'm just coming up with it on the fly.