You can ask UA to see if they have made some arrangements for their pax. I am not aware of any, all of the Aussie Airpass products on QF require flying QF trans-pacific. The airpass are a good deal, but in the past year QF has lowered prices a lot if you can book in advance (catch is that those discounted fares are "use it or lose it", no changes allowed and becomes worthless if you are a minute late for the flight; the Airpass is fully changable).