As well as the Star and One World tickets there is also the VS/SQ/NZ thing called “The Great Escapade”. This would seem to fit pretty well with your trip, but as pointed out earlier backtracking to Asia may not be permitted. The general rule with RTWs is that you can go where you like as long as you keep going in broadly the same direction. Have fun!

http://www.thegreatescapade.com/