It's an Australian thing. Doesn't happen in the real world. Try moving to Europe...
Seriously though, just stick to the SOPs and politely refuse to depart from them. If your captain presses the issue, and it is a serious departure from company SOPs, press the "event" button on the DFDR and try to get him to repeat it before the CVR loops over itself. Have a chat to your Base Captain or Fleet Manager about it. If any of your managers tell you to "shut up and do as you are told", get them to put that in writing.
Of course all of the above will jepoardise your job if your airline is as dodgy as it sounds. The only other option is to "go with the flow".
One further option... probably a job-killer... go see the CASA Flight Ops Inspector for your airline.
We've all been there, you have to be a little pragmatic in the airline business.