I appreciate the help! thank you
Am I actually allowed to do 6 reward flights? (provided it is 5 continental zones?), I haven't quite figured how that works
You can actually do up to I think 16 flight segments, just only 5 stopovers (international transits <24 permitted on top - can't remember the rule for domestic transits). So provided you wan't to stop at all your listed ports, and didn't want to stop at LA it's fine to include (provided it meets the km max without actually working it out). If you wanted to stop in LA for a couple of days then I the 'overland'/buy a separate ticket option could work (overland section included in total km).
Haven't done this award in F, but had some good trips on the J and Y versions and have nested other flights in the middle of the itineraries (including flying back to Australia for 5 months in the middle of a OneWorld award). Could also think of starting outside Australia and buying a cheap return flight to SIN or HKG to position.