Ah, so you have flown the 380.
Seeing you want to get to SIN, the easiest one, with a dom connection from BNE, would be MEL airport. 2nd choice after MEL would be SYD, where QF buses get a dedicated road to use, between T3 and T1.
Getting an upgrade with points on a QF dom flight, you can get confirmation straight away.
But the goss on here for int flights is that it all (success) depends on your status, so apart from earning points from credit card spends, maybe you could also between now and the big trip do some QF flights around the country, to give yourself more chances of getting the J or F seats.
I am SG, but have not used a points upgrade int basis.
Not sure of my success if I did do it though.
I have noticed one very sneaky thing that QF does, is that it gives a very narrow time frame for dom to int transfers at SYD for those who don't live in SYD, for timings to use the J or F lounges. 1.5 to 2 hours after dom flight arrival, rush from T3 to T1 can take half an hour depending on the QF bus and its drivers, getting pass immi can also take time, 15 mins, theres 45 mins gone, 15 mins for the walk from SYD immi to the lounge and then 15 mins walk from lounge to gate...
Best of luck anyways.
Oh for the love of....
Seriously Poochie, you go off on so many unrelated tangents and assumptions and comments that it's hard to keep track of whatever point you're trying to make.
As I understand it, the OP is looking at points redemptions in J or F ex BNE to go to SIN. It's possible one can get an "F" award BNE-SYD-SIN or BNE-MEL-SIN with the domestic sectors "thrown in" in J. However the OP may wish to arrange their own transport to a gateway depending on the end result.
Not everyone is as totally obsessed with the FLounge as you are, and now you've finally been to the MEL one I thought your zeal may have subsided a tad since you seem disappointed. I would say some people prefer the MEL lounge because, while it is smaller, the service can be better (my last few times in SYD the service has been poor and the place crowded but everyone's experiences vary).
If the OP can fly post March when it seems EK405 MEL-SIN will be on the 380, then I think that gives the best of all worlds, assuming F availability is there (that's a whole other ssue, but at least the 380 has more F seats).
Finally re connections - your comment is, IMHO, rubbish. There are many connections that can be made over hours. The reason QF offers, by default, the shorter transits that are close to MCT are for the convenience of passengers to have the last amount of time waiting between flights - which most people without lounge access, or who simply just want to get to where they're going would prefer. However it is entirely possible to make longer connections for QF dom-international specially for afternoon and evening departures (obviously if one has a 19 or 10am departure out of SYD it's difficult to get a long connect if your first departure out of MEL or BNE can only get you there around 0730.
Last month I organised and flew a 3.5 hour transit in SYD between MEL-SYD and SYD-SFO - plenty of time for a leisurely lunch in the lounge, some relaxing time watching the ramp and then to go endure the fun at the gate.
Point is that suggesting QF providing short connections is "sneaky" is ridiculous. I can understand the more practical issue of a too short connection being difficult to make a flight, specially if your domestic connection is delayed, but most airlines around the world follow similar practices - it's just that the SYD dom->int has the extra hassle of having to clear immigration and security(again) in SYD which can add time and hassle on top of the bus, but it's far from "sneaky"
Back to the OP - if it was me and given all you've written I'd aim for BNE-MEL-SIN on the EK flight - even if you can only get a J award the product is going to be pretty good with the bar and stuff. F is much nicer specially on the longer runs, but may not be so easy to secure. If it were between BA and EK, which are the only real options for First, I'd go EK even with the later arrival in SIN. My 2 cents.
I'm all about keeping my options open... 
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