Auckland to Darwin return in business for NZD1730 earns 320sc Cheaper in AUD.
Auckland to Perth return earns 320sc as well.
Auckland to Bali return earns 400sc ~2.6k NZD

Asia (Manila, Jakarta cheap fares) to Europe with Qatar in J return earns 320sc. Just play with google flights to find best price but can get down to ~2.5k NZD return business.

You could fly economy on Qantas to Manila or Jakarta ex Sydney. Day flight out, red eye on return.