If they do implement their new RPs they won't get the productivity increase they think.
Under the current work load sickness rates are already industry leading. 2 Man Aussi and 3 man Europe will just push this further.
If you are too fatigued to safely work, don't do it! File an ASR-F. Doesn't matter if you are on reserve or '…it is legal…'.
This isn't an AOA Vs CPA action. It is basic aviation safety and professionalism.