It's done by demonstrating to CASA, within the framework of their regulations, that the risk is acceptable to them. Badgering people on web forums doesn't cut it.
That appears to be the key issue. Based on evidence casa accepted that CVD pilots were not unsafe and therefore an acceptable risk. Yet, it appears that based on the same evidence they or individuals within the organization have now changed their mind. As Creampuff and others keep asking show us this new evidence that supports casa change of position. Still waiting! It is the fundamental point. Support your case with empirical evidence. If they can't it smacks of bullying, harassment and victimization of CVD pilots.