I had thought that you can only fly/transit in SYD/MEL only once? No?

Nonetheless, your itinerary is very similar to my DONE4, but in opposite direction.

Mine is for work but have two destinations that I am visiting as a side trip (thanks to OW rules )

ICN-NRT-DEL-NRT-BKK-SYD-EZE-LIM-SCL-LIM-EZE-LHR-DXB-LHR-GVA-HEL-ICN

but I may change to

ICN-NRT-DEL-NRT-[SYD-EZE-LIM-SCL-IPC-SCL-MAD]-GVA-LHR-DXB-LHR-HKG-ICN [in LA codeshare or LA flights]

6 segments flown on LA or LA codeshare flights count towards 6 segment required in business class for lower km requirement for Comodoro status with LA (which is their top tier membership). Plus, IPC is a very interesting place which is quite difficult to get to without DONEx.