"I don't think anyone wants to hear that I am anything less than delighted about losing my kids, financial security etc. I'm a bit of a buzz kill! "
I am a bit confused, what do you mean losing your kids? Is he demanding some sort of custody of them? I would be fighting this tooth and nail, or have I read that wrongly?
I think you could possibly say that if your friends really are not interested in your life and what is happening to you, they are really not friends. So by all means have a coffee with them, or use them for babysitting services if you know and trust them.
But make new friends.
I'd not be burning my bridges with friends because you may need them, and you may wish to have at least an ear into what he is saying.
"I know I shouldn't put any real faith in friendships, but I am sorely disappointed that folk who know about the abusive side are being "neutral" or allowing themselves to be courted by him. I don't feel very neutral about any of this."
You should be able to rely on real friends. Is it a herd mentality thing? Could you single out your best female friend and see if there is any solidarity there?
I don't feel you should take the blame. I honestly think you need to decide either to tell the truth, or tell a version of the truth that makes it clear it is your husbands fault that your marriage broke down, or talk about it as departure from each other and no blame for either of you - if that is easier for you. You really should not take all the blame.