American and Qantas have a discounted premium economy fare LAX-SYD-DPS... In the range of $US2000
Dates are limited - 2 weeks starting in mid February works when I looked....
The incoming connection at SYD is horrible but would be worth it for the PremY seat transPac.
Find that (google flights) then hold on AA and see what the JFK add ons would cost.
Slightly more comfortable wandering
Fred