Black Maria,
I'm not first-hand familiar with all the aerial medical work being flown in Australia. But at least some of it is niether PVT, or CHTR (and it's obviously not RPT). It falls under AWK - so is commercial in nature but not subject to some of the requirements written for CHTR/RTP.
And I too suspect you're correct in your statement about "wheels of progress" and real world, acceptable time to put something in place. Perhaps CASA could include this change in their document re-write...
PCX,
Perhaps the nurse is considered to be a crew member and cabin attendant, giving briefings to pax etc.
But yeah they would be going well to get 15+ onboard anyway...
And it's got an autopilot...
CR.