hi francis-
i would go with option #3, let go and practice detachment.
take all that energy you spend on him and turn it onto you: your recovery, your goals, your life.
you might want to explore your options for financial separting from him...things like bank accounts, credit cards and car insurance. perhaps discuss the business options with your accountant...how to protect yourself.
and then, i would just let him (hopefully) hit his bottom. i wouldn't engage him about his drinking anymore...i would imagine that's all been said and he's choosing to drink...he's his own person, it's his life.
naive