I am afraid the only advice IS LTB because this is not just abusive, but it's clearly got to absolutely epic proportions.
I'm guessing however, that as he's a SAHD, you're not quite sure how to go about this LTB option? I can very easily imagine that this is a huge challenge. Would he fight you for custody? Which means I honestly don't know the answer.
I would suggest that perhaps it's time to stop having him as a SAHD. There's not much value in it for you it sounds like as, at best, when he's sulking he sort of looks after the DC but not particularly well if he's also not talking to them, and he certainly isn't doing anything for you? Is it possible to start working towards him being back at work so that LTB becomes a bit easier down the line?
[and before anyone comes hounding me about the difference between men and women and all the rest - the reality is that a man who has a SAHM wife who was abusive to him and who he was hugely involved with his children would also have the same issue with leaving her. But we all know that in reality, when a man with a SAHW leaves, he's quite happy to leave the DC too to a large extent)]
I'm also really really not a fan of tit for tat, PARTICULARLY when it comes to abuse, but I have to wonder if there's a point you say to him, "right, well, if you think you can just opt out of our relationship and parenting and basically your responsibilities, I'll do the same and start restricting acces to money." But the truth is, that I really don't think that's going to give him any incentive to get better but probably would just make him sulk even more and retreat even further rinto "I'm a victim" mode.