Join Date: Apr 2004
Location: SYD, YYZ, Southwest UK, a beach somewhere in the world
Programs: AC Prestige, BA Gold, SPG Platinum
Posts: 313
Only option would be a stopover.
I believe QF still fly F from HKG-SYD, and you might be able to find one of the JL/CX flights from NRT-HKG that still has F class, but it's dependant on the aircraft which switches quite frequently.
Otherwise, you're stuck doing NRT-SIN/BKK and grabbing the BA flight to SYD from there.