IMO if you begin by fixing the ATsB and making them truly independent, like the TSBC, then you are well on the way to addressing the bureaucratic embuggerance of the Oz aviation safety system.
Although loosely modelled on the Yank's NTSB, the TSBC's act should be seriously looked at (
Canadian Transportation Accident Investigation and Safety Board Act) as a template for a possible TSI Act 2003 replacement. Consideration should also be given to totally divorcing the ATsB from the purse strings of the Department and directly reportable to the Parliament.
Not sure about the Canuck's CARs, they do seem to largely mirror the US FARs... :
Canuck CARs
At least they're contained within 1000 pages and would probably be less if they didn't have to run a French version alongside...
But perhaps it would be more advantageous to aim for regional uniformity (i.e. the NZ regs) but you could do a lot worse than adopting the TSBC model for our transport safety investigator, coupled with a purge of the senior ranks of both Fort Fumble and ATsBeaker...
Till then
....TICK TOCK! 