You'll have to go via South Pacific one way and Central / North Pacific the other way. What you describe is little more than a return trip rather than a circle trip.
The disincentive for Circle Pacific trips for the Business traveller is the long route via SE Asia to the US from Oz. Otherwise everyone would take it becasue of the very high Business fares Oz to USA.
You can do SYD-AKL-LAX-DFW-YVR-HKG-SYD within the 22,000 mile limit on the cheapest fare.