Only in Australia from my experience would an IFR aircraft on an IFR approach go in and out then in again to controlled airspace.
Agreed, it's very poor form in a supposed first world country and for all the boasting about how much airspace is 'controlled' by this mob.
So if you are given the BK 11 LNAV approach by Sydney Terminal when you are OCTA approaching RAKSO does that allow you to enter and leave the class C airspace on descent to WI?
Given or cleared? ATC can't 'clear' you for an approach that is outside controlled airspace, that is your choice and decision. They shouldn't really be 'giving' it to you either, that implies a clearance.