The only Plan B with a glimmer of hope is this:
Convince the non-major party aligned Senators that the right thing to do is to implement the recommendations of the Senate's own AAI Report and ASRR Panel report commissioned by the government. Convince the non-major party aligned Senators to make their agreement to government legislation contingent on substantial action having been taken to implement the recommendations. Not hot air: Action.
A number of the non-major party aligned Senators continue to believe that their job is to further the public interest, or at least the interests of the part of the public that is each Senator's constituency. Those Senators may see the obvious public interest in implementing the recommendations arising out of the Senate's own Committee report and another report commissioned by government. Those Senators might ask themselves: "What is the downside in implementing the recommendations of both reports?", the answer to which is: "For the public, no downside and all upside."
Plan B requires people to confront and deal with a potentially painful reality: The Laborials are very happy with ATSB and CASA, and the Laborials have zero interest in doing anything for which the Laborials, rather than ATSB and CASA, could be exposed to flack. The Laborials govern in their own interests, using the Orwellian logic that whatever is in their interests is the public interest, because the public elected them.
The recommendations of both reports would be implemented, in a trice, if the non-major party aligned Senators made the passage of government legisation contingent on implementation of the AAI and ASSR report recommendations. In a trice.
If you're waiting for the Laborials to do 'the right thing', when it's not politically expedient and advantageous to them to do 'the right thing', please don't hold your breath.
Two or three sentences: Dear Senator, there is all upside and no downside for the public in implementing the recommendations of the Aviation Accident Investigation Report made by the Senate's own Committee, and the Aviation Safety Regulation Panel report commissioned by the government. It is pointless going to the time and expense of conducting these inquiries and reviews, if the recommendations are merely paid lip service. Please press for these recommendations to be implemented, in the interests of aviation safety in Australia.