I went into the Ragasa rebooking window holding (all separate bookings):

1. QF124 Y redemption 23/9 ZQN 07:05 SYD 08:30
2. CX138 J redemption 23/9 SYD 21:50 HKG 05:10
3. (When Ragasa track started to become known) CX100 Y redemption 23/9 SYD 14:05 HKG 21:30

(2) and (3) were both cancelled at 15:30 HKT. My preference was to rebook (2) into 24/9 CX138, but had no luck calling in from 15:30-01:30 even with one Kingking, two Google Voice call out devices and doing a bunch of hacks to try to get through. One Kingking call was 6 hours long before it dropped.

I was automatically rebooked while I was calling:
(3) Got rebooked into 23/9 SYD 10:10 HKG 17:50 (last CX flight before shutdown?)
(2) Got rebooked into 27/9 QF405 SYD 06:25 MEL 08:00 27/9 QF29 MEL 10:20 HKG 17:55

Rebooked (2) was a non-starter, I’m simply going to refund that segment. Rebooked (3) is a good arrival time but reduces my connection in SYD from 6 hours to 100 minutes. While possibly doable, there’s no buffer for anything going wrong before getting to CX departure desk at T-60 eg not even an extended Customs inspection.

When I explained my circumstances to the J check in in QF ZQN, she kindly checked my luggage through, despite two separate tickets.