I used to see the QF flight numbers on EK metal ex UK a lot in searches for BKK when EK operated EK418/419 which was DXB-BKK-SYD-AKL/CHC rtn (the New Zealand destination changed over the years). Since the removal of that route I've seen them much less, but Expedia shows at least EK384 and EK372 available with QF codes, although prices were ridiculous, so something might be possible.