If this has already been posted, apologies, but there is a nice sweetspot in the new deval'd charts which is North Asia to Oceania for 37.5 in J / 47.5 in F.
Go to TBU and you will be routed via Australia (probably SYD) and/or New Zealand (AKL), and you could get off the plane early and have it as ICN-SYD for 37.5K in J etc...