While we wait patiently for Jafula's official support, I stumbled across this AddOn on Curse last night and was considering giving it a go.

It's called FZ Cross Realm Communicator: http://www.curse.com/addons/wow/fzxc

It looks like it will do what I was describing with using a given toon as a sort of relay node, but I haven't played with it at all yet. Anyone else have any experience with it?