EK 2 x pilot SIN-BNE/MEL, KUL-MEL, BKK-SYD. Don't go to 3 pilot until flight time >10hrs based on seasonal average hence 3 x pilot (1 x CA and 2 FO) DXB-PER.
So local starting time is not a consideration? 10 hours two crew red-eye is starting to push it a bit.
Guess it helps that the regulator owns the airline