Interventions can work - I have been involved with one - but there have to be consequences if the person fails to choose rehab. Consequences such as you no longer have a job, place to live, etc. Get his boss to go in on this if he/she will. Also rehab is mandatory, I've never heard of an intervention to go to AA. But it sounds like no one wants to spend another $10k? Get a professional to do this, you cannot do it yourself IMHO.