What is really needed is a support system that doesn't include the finishing of one's airline career as is the case in the US. If we can accomplish this, more may be willing to come forward, admit the need for help, and get it.
Removing the threats/fears is the only way to get honesty/openness from the pilots.
I would add the the treatment could involve a period of grounding (with full pay) but with closely supervised flights (3rd pilot on fd?) to keep all quals upto date (ready for a return to duty). Demonstrates an expected return to normal for the pilot.
In cases of permanent grounding there has to be a decent compensation package.