Sweet reason, letters to politicians, august deputations from Associations carrying well thought out and carefully worded presentations, briefings, entreaties and reports. All of this has been tried with zero effect for a long time.
We tried yet again with the Truss Aviation Review. The result was a big fat zero.
It is all "too hard" for politicians because CASA simply says "its a technical matter that you know nothing about Mr. Politician" and "if we act on your suggestion then YOU will be liable if there is an accident" and "All of these airplane owners are rich bastards - Silvertails, unlike the rest of your constituents".
I respectfully suggest that the only way forward is for Aviation enthusiasts to add as large a measure as is legally possible of electoral uncertainty into the next few elections. The only thing that will get a members or a governments primary attention is a threat to their continued career.