A couple of quick comments.

The 03:00 departures aren't a good idea for lounge access. At best only a very small part of The Wing (not including restaurant, cabanas, etc) will be open after about 00:30.

Presumably the last leg is SYD-BNE not BNE-SYD.

I see this is 21355 miles so I assume you are getting the CIR22 fare. Hence, not much room for more distance, but maybe you could somehow squeeze in two or three more segments?

e.g. go NRT-TPE-HKG-BKK-SIN-DPS-SYD (NRT-TPE-HKG-BKK-SIN ticketed as four segments but actually just two flights with stops). Obviously it adds a few hours to the total journey time, but it's still under 22,000 miles.