Well, apparently xLAX adds North America so this would mean upgrading from AONE4 to AONE5. And SYD-EXE appears to go via SCL anyway. Unless I've missed something?
Yes, xLAX adds NA but since you did not post your itinerary I had no way of knowing it was not a part of your AONE. Going from AONE4 to AONE5 is likely to be cheaper than buying extra flights so it is just one more option.
SYD-EZE is a new direct flight that QF will start in Nov. Again, without details of your travel plan this is probably not applicable to you but it was offered as a possible solution.