I'm not telling you what to do, but I will tell you that I know your pain. You're describing the life I used to live with my xAB of 23 years. I, too, desperately wanted my xAB to leave, but I was afraid I wouldn't be able to handle things financially. Well, I not only handled things, I'm flourishing, financially and emotionally.
My advice to you is to do what I did before I made my life-changing decision: I prayed for guidance and strength.
For me, leaving my AB was the best thing I've done for myself in a long time. I don't miss the chaos, I don't miss the lies, I don't miss him claiming his drinking was all my fault, I don't miss the drunken stupors, I don't miss the trips to the ER, I don't miss driving him to AA meetings, I don't miss his self-centered alcoholic behavior. In fact, I don't miss my former life for one second.