I'm surprised nobody has mentioned CHIRP. (or did I miss it?).
A non-collusive flood, or even a good trickle, of reports to them with brief graphic descriptions of, for example:
Incidents,
Nearly-incidents,
Post-fatigue adrenalin rushes,
and in particular any report any instance of crewing/commercial pressure on you to operate when you have declared yourself unfit to do so.
- will certainly generate pressure in the right quarters from a highly respected source and respect your anonymity within the company, be that EZY or elsewhere.
In my direct experience the director (still PT?) will respond and take action in the interests of both the travelling public and all professional aviators.