This sounds like a remarkably familiar tale!!
Also sounds remarkably North Island, East coast-ish type of operation
I'd get involved with ALPA, record & document everything, keep pointing out non-compliance issues with the boss, if still nothing being done to fix things then ask ALPA to represent your concerns to management.
Even try and get a "united front" with all the other employees (ALPA membership etc) so that the boss doesn't think he/she can just replace you with a click of their fingers.
I know it's a bit of a "ideal world" scenario but the cycle has stop somewhere. I sympathise with your predicament as I was involved with a similar operation that wasn't as bad but was short of compliance is some areas & I witnessed on operation as described in the original post.
Whatever you do don't compromise your safety for your boss' bottom line. He won't give you a bonus for it or even a thank you, because he would be acknowledging YOU were breaking some CAA rule for his benefit.
Good luck
S2k
NI, East Coast
2000-2004