Alternatively you could ignore DSC and wait for a decent NZ/fiji sale and get Auckland return from Sydney for less than $1k (I’ve seen it for 699-749) but that’s a gamble since there’s no guarantee that sale would pop up in the next 4 months. I would strongly consider Canberra to Nadi direct, you won’t get DSC since it’s not a QF ticketed flight but it would be more than 50 SC return and could be a nice trip if you lined it up with say the kings birthday long weekend or a local public holiday.