mostlytossas, that's pretty similar to MSIC's - at a particular port operator in Sydney, you can go through the security gate but require an MSIC to go onto the wharf. What's on the wharf which perhaps equates to being airside? a line stating maritime zone.
However once past the security gate either by swipe or signing on, it's not like security follow you around.
Another form of government Id does the trick but the gov makes more revenue but adding another layer, smart and efficient nation.