HNL is NA but you can't get there from NRT (JL code share is not allowed). Only international OW flight out of HNL is to SYD. Anyway, stopover limits on CIRCPAC fare would not fit your trip.

I don't know what your individual trips will cost out at but if you did do a OWE it would be four continents and cost around A$3000 in economy and A$9200 in business. To meet the OWE rules your itinerary would need to look something like SYD-HKG-PEK-HKG-NRT-ORD-LHR-HKG-AKL-CHC-WLG-AKL-SYD. I doubt you could actually do the NRT-ORD-LHR-HKG-AKL-CHC segments in the 48 hours you seem to have between trips and I sure wouldn't recommend doing it in economy.