So.. I wasn't sure about Jetabroad, so I ended up booking through Expedia (which had a better rate in any case - $1,600 AUD one way is pretty good from KUL, vs $3300 AUD from SIN).
The interesting thing (since I've never used Expedia for flights) is that on my credit card statement, the sale went through as Emirates Direct Sale - and Emirates doesn't seem to show it as an external ticket once you type in the PNR.
The issue is however, that no seats are available for upgrade, despite only 3 seats being full (I called to double check this). Since I don't have status anymore on Emirates, I'm guessing I won't be able to upgrade till MUCH closer to the date.
The flight is still a couple months away, so I guess I'll wait.