Re: QFF points and QFF SC, if its important to you:
If you want to earn QFF SC, small as it is, JQi to DPS and something in OW from there will do the trick.
JQi will have to be in a bundle, that earns QFF points and QFF SC, they charge more than the basic fare.
MH while it an be good, but there are only 2 bands of earn in QFF flying MH, basicY (discY), and flexY, so even if you fly MH J, and put in your QFF into the booking, you will only a small flexY earn of QFF SC.
Other partners are more or less the same, QF wants us to fly them, flying with partners in OW, is a smaller earn.
EK with a QF flight #, while very expensive, will be the best one to use in prem J/(F), have done them several times SYD to CHC, lounges very good, food on board very good.
If you have an inkling of an upgrade, I know you didnt mention it, but that would rely on your QFF status for success, ie, even if you have a lot of QFF points, you have to be upper grade status to succeed.
And Dec & Jan is a busy time, so even a rev booking, might be a tight one, that is why as the other colleauges have mentioned, best to split the flights, not ideal, but might be cheaper a bit.
If you can bear it, without lounges, premY can be ok too, EK with a QF flight # via DXB, lots of lounges do accept $ to enter, or PP/priority pass.