You could always apply to be an SO at a later stage.
If you 'think' you might be interested in the QF gig you would be best to apply sooner rather than later. Your professional life will be ruled by your seniority number. Nobody ever wished they were more junior in this game!
Unless you're already in the left seat of an Australian jet (or very close to it) or over about 35-40 years old then you could do worse than a QF SO position.
Anyone going for this position, however, needs to play the long game.
Patience and time invested should reward handsomely one day (as long as you are young enough to be able to afford the wait!) and you will enjoy an extremely enviable lifestyle (think above-industry-average amounts of time off) along the way!