As far as curfew-busters go, remember that it's not just the aircraft's noise footprint to consider. Landing must be 34L and departure must be 16R.
There are plenty of occasions when the wind would preclude one or the other.
How does an airline schedule flights under those restictions?
Sydney's curfew restrictions should allow an operation to depart 34L or land 16R if the downwind to operate under curfew runway use requirements is prohibitive.
Only Medivac flights have that luxury currently.