Thank you for your response.The mileage and stopovers look fine, and yes it is common to book additional flights as they come out. IMO the hardest part will be getting seats on the QF flight to JNB. Qantas does not release those 297 days out (or any other standard release date for that matter). This is not a Bronze status issue, here's what I see for June 2026:
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You may need to look at a more creative routing or alternative way to get to JNB if you want Business class. Cathay HKG-JNB is one I have personally booked.
Do you know if there would be any issues booking the later legs first, if they became available before the exAus? Or does not departing from AU cause problems?
From my research CX and QR flights were extremely difficult to book, especially for J class and that being one of the longer flights on our itinerary, that's something we'd like to maintain. That's probably the main reason I've left both of those airlines off my itinerary.

