At the end of the day, the LAME who certified for the defect should raise an SDR on a Form 500, if he/she hasn't already? Also, a report should be made independently to CASA, followed up with a letter explaining what the situation is to both the Minister for Transport and the Opposition Shadow Minister. They can only ignore the alarm bells for so long.
For those who are unaware, the LAME owns the licence, not Qantas. We still have a duty to ourselves and the public, even if there are certain pilots(99% do the right thing,and have the highest ethical standards), and certain managers(reverse the last statement) wish to ignore the procedures as set out by said management.
If the LAME feels the system is failing, its time to step outside of the company procedures and alert CASA (who may not want to hear) and those who make the decisions, the politicians. If nobody wants to listen, then there is not much more that can be done apart from repeating those steps until an accident occurs and the ATSB gets involved.