The Oneworld rules tend to be a lot simpler than for Skyteam and Star products.

About the only routing rule on Circle Pacific is the need to cross both the north and south pacific (and those are defined as separated by the equator, so no strange geography issues) and to stay on Oneworld airlines. The mileage limit is enough to limit creative routings.

Your route is 21,873 miles for LAX-HKG-SIN-BKK-SYD-LAX