Another possible option someone suggested was something like this. It would cost 135K AA+90K CO.
The problem is the long overnight in HKG after the Virgin Atlantic flight. There's also just 1 week in Australia with this itin, but I do get to go to HKG and SIN.
We 12/29 CX 827, YYZ-HKG, 2:15pm-7:00pm+1, First.
Su 01/02 SQ 871, HKG-SIN, 7:55pm-11:45pm, Business.
Tu 01/04 SQ 237, SIN-MEL, 11:45pm-10:10am+1, Business.
We 01/12 VS 201, SYD-HKG, 3:45pm-10:00pm, Business.
Th 01/13 CX 826, HKG-YYZ, 4:35pm-6:25pm, First.
Alternatively I suppose I could do
Th 01/13 VS 201, SYD-HKG, 3:45pm-10:00pm, Business.
Fr 01/14 CX 826, HKG-YYZ, 10:45am-12:35pm, First.
But it's a little risky with shabbos starting at 4:48pm and I'd have to spend shabbos in Toronto.