I have it done somewhat often... have someone here local to me and also someone in Oz who does it. (I supply the guy in Oz all the outers so makes it easier)
Due to your location, like mentioned by the time you paid shipping back and forth, for the new 10" outers and labor, you might as well just order a new pair of wheels and only pay shipping one way and sell your 8 1/2's... unless you find somewhere there to do it ?