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Ok...here's another idea.
Buy a oneway Y ticket SYD-HKG.
(Stopover HKG)
Fly HKG-YVR J class redemption 92 000 points per person.
(Arrive into YVR in good shape after J class flight)
Fly YVR-SEA-HNL Y class redemption 28 000 points per person.
Stopover HNL.
Fly HNL-SYD Y class redemption 36000 points per person.
Total points would be 156 000 points per person. (If you're short you'd be close enough to buy top-up points.)
Y class fare SYD-HKG (flying MH) approx $505 pp incl taxes.