I would stay completely out of it - there is nothing in what you shared that points to a person ready to accept a need for recovery. If being removed from the family home isn't a wake-up call, what do you think will be?
Yes - this is part of his natural consequences & sometimes the very best thing to do for someone is to get out of their way, let them fall & give them the dignity of making their own decision to either spiral down or reach out for help.
Help is everywhere for the person that WANTS it.
fwiw - I was involved in one informal intervention years ago & it was horrible despite the fact that her addiction was beyond obvious. It completely altered the relationship going forward & of course, she refused the suggestion for recovery. She died a few years later due to health complications from her alcoholism.