LNIDA
Thanks for a well balanced post. If a system like yours was in place here I would be very happy. I don't travel in uniform to jump the line, just because I have to.
As for fatigue/tiredness, my opinion is there are so many factors in each person's life affecting your readiness to fly an aircraft that we have to leave that responsibility to each individual. Sometimes I land less than 12 hours, assuming that's your legal minimum rest, before next report time. Yet I am more rested than my colleague who lives locally but had to spend the night taking care of a poorly baby.
Regarding immigration I understand there are rules in place. But considering the two biggest bases lie outside Schengen and many commutes go via them, sometimes with short connections, going from plane to plane without passing immigration and back through security may be the difference between another day spent at home or not. You can say it's irresponsible/reckless, but as close to everyone as possible that I know of do it for simplicity. If there was enforcement in place and people actually lost IDs I am sure it would change. It's a risk you take.