What would you propose as something "... to effectively address 'pilot suicide'..." ?
I don’t know if it would ‘effectively address’ pilot suicide, but implementing science based flight and Duty time limitations would directly effect the mental health of pilots. Lack of recovery time after circadian disruption is known to lead to depression and my uneducated guess is that increased depression amongst pilots leads to greater risk of ‘pilot suicide’.
Australia is a good example of how Airlines successfully lobby to prevent implementation of fatigue rules, ie commercial gain outweighs safety.