Negative campaigning in marginal electorates is the only approach that will succeed. CASA and the Department will wear you down in endless committee meetings if you engage wth them ("what precisely do you mean Mr. Smith?"). You will die of old age before the institution changes that way.
The only way forward is for a frightened Government to instruct PM&C to fix the CASA and give AOPA what it wants. You need lessons from the attack dogs of the CFMEU.