A great way to prepare for a *A RTW is using the book-and-fly tool that is on the *A website. You can easily make your own route, get pricing, pick the available airlines and even book your RTW.

The Business RTW comes in 3 prices depending on the number of miles you are flying. Starting from SYD will probably be an expensive one, the pricing is also determined on the country where you start your RTW. Japan and South Korea have been some of the cheaper starting points in Asia.... so an RTW starting there might be your best option, combined with maybe an award to position yourself there.

And you can use an RTW for a whole year, so it would be viable to get back to SYD and then take that last leg to Asia to close your RTW at a later date. You really need to get the best value out of it, otherwise you might be better of using one-way awards in programs like Lifemiles with miles you buy..... No miles earned but a lot cheaper when making just a few stops.