Hi all, seeking some advice on how I could optimise the YQ/YR on this DONE4 itinerary via codeshares and ticketing carrier, for now this is what I have planned to optimise points earn on AY. The advice I've been reading on the forum has been highly insightful and appreciated.

OSL-QR-DOH-QR-DUB-QR-xDOH-QR-GRU / SCL-QF-SYD-AA-ZQN / CHC-AA-xSYD-BA-HKG-CX-HKT-CX-HKG-AA-SIN-AA-xHND-BA-xLHR-AA-OSL

AY earns the most on AA,BA,IB, which I've chosen where possible, but unsure if this is feasible on all these flights or if I am being overly ambitious. Also reading that issuing it on QR via Sabre would avoid other carriers' surcharges, how easy is it to find a TA that can do that? Open to suggestions on how to tweak the itinerary if necessary. Thanks all in advance.