Because the event that we have to get back for, Oxfam Trailwalker, is a 100km run that my husband is participating in. Having done it before (it's GRUELLING) he wanted a certain number of hours "recovery" in HK before having to get ready and the diversion via BNE adds about 6 hours to the journey which makes it an overnight flight back and not the "nights in a bed" he needed as preparation. He was only prepared to come on the trip provided he didn't compromise OTW and flying PE (for him) and getting back when we do was critical. As noted, I have had Biz seats with points waitlisted for a month already - if they confirm them then I am sorted. Or put a plane with PE back on the route (I'm hoping I am not the only person complaining! and it IS 2 months away which is plenty of time to fix the mess).
EDIT - and yes I will come back with what happens, when I know. Thanks all for your suggestions.
I understand your situation, however there are many ways to skin a cat, an afternoon flight on the 14th to Sydney after the eclipse, then a day flight ex Sydney on the 15th (all flights have PE) will still have you in HKG ready for a good nights rest, especially with a 3PM arrival:
[TABLE="class: itinerary"]
[TR="class: even1 last"]
[TD="class: flightNb"]CX110 [/TD]
[TD] SYD 08:35 [/TD]
[TD] HKG 14:55 [/TD]
[TD]
[/TD]
[TD]
[/TD]
[TD]
[/TD]
[TD="class: centeralign"]
[/TD]
[/TR]
[TR="class: odd1 last"]
[TD="class: flightNb"] CX162
[/TD]
[TD] SYD 11:30 [/TD]
[TD] HKG 17:50 [/TD]
[TD="class: centeralign"][/TD]
[TD][/TD]
[TD]
[/TD]
[TD]
[/TD]
[TD="class: centeralign"]
[/TD]
[/TR]
[TR="class: even1 last"]
[TD="class: flightNb"] CX100
[/TD]
[TD] SYD 15:40 [/TD]
[TD] HKG 22:00 [/TD]
[TD="class: centeralign"][/TD]
[TD][/TD]
[TD][/TD]
[TD] [/TD]
[TD="class: centeralign"]
[/TD]
[/TR]
[/TABLE]
I doubt CX will re sub the aircraft, their loads would be pretty fixed this far out and with the lack of alternatives in BNE and CNS, pretty heavily subscribed given the eclipse.