I have been finding the same (limited J availability), so today I made my first "change" to our 2019 booking, to get part of the way home. Taking advantage of Qatar's release of seats at 360 days, I added a 2nd October CDG-DOH-SIN leg to my existing booking (as well as an intra Europe flight VCE-MAD-GVA on IB). There did not appear to be any QR availability from DOH to AUS at this stage. Taxes and fuel fines for these flights were very high at a total of $877 each (on top of the $500ish each already paid to get to Europe in August).
A further change will be required to finalise our intra EU itinerary (probably add a side trip somewhere) and also get back to BNE, but for the moment I was happy to burn the extra 2 x 5000 points to at least be assured of J class to Asia!!
Our itinerary so far (fairly simple as Mrs Aus ATC is not into convoluted itineraries):
BNE-HKG-LHR. Stopover.
LGW-GOA. Stopover. Cinqueterre, Florence, Cruise ex Venice.
VCE-MAD-GVA. Stopover. Independent travel around France.
CDG-DOH-SIN. Stopover or transit. This last leg could actually change totally, subject to better options to get home becoming available.