Atropos
You obviously mean well but I think you underestimate the gravity of the problem.
If we are talking of alcoholism here and seems that we are, the problem does not rest with 'the boys'. Those with knowledge of the problem owe it to the company first and foremost and colleagues after that. You also seem to have forgotten passengers and public in your list.
Have more faith in your management, after all it is nearly 2003! The Dark Ages are long gone and this problem will not be cured by it being merely pointed out by colleagues or a friendly Trainer. What happens in the meantime, whilst the problem is progressed up the line? Will he still be flying?
Anyway, the reaction of the alcoholic will almost invariably be to the effect that he doesn't have a problem and what has it got to do with you? You may even lose a friend.
The biggest win/win, as you put it, is when the individual is cured and restored to the line and that is where enlightened management and the CAA, working in harmony, stands the best chance of success.
Sorry, don't mean to preach, but please believe me that it does work my way.
boris