I think your plan is good. If you need space to find peace, then you don't need his permission to do it. If he wants to be a jerk, let him be a jerk all by himself. You don't have to be around it and it would definitely be healthier for your kids.
Have you thought about taking our son to see a therapist or alateen? Do you go to alanon, celebrate recovery, or have any sort of support for yourself?
I have to share this with you, I complained to my therapist how one of my sons is so disrespectful towards me. Her response was, "So, your alcoholic husband is the king of disrespect in your home and you expect you children not to be the same?" It was a wake up call. Its so true. How can I expect my son to respond to me properly if my own husband is so disrespectful? My husband is teaching this to my sons! I felt a little ill when she pointed that out. But this is reversible. You don't have to keep doing the same old same old. I think your plan is a good start. I'll be praying for you! Hugs