Assume you mean DNM or DRW or ???? not DND (Dundee Airport , Scotland)?
The bigger concern is MPM (Max Permitted Mileage+15% rule) which for BKK-AKL is 8,206 miles
BKK-SIN-DRW-BNE-WLG-AKL might work, if flights exists on *A carriers
The number coupons should not be an issue. RT or OW?