Have you had any legal advice at all, op?
If not, see a layer in the first instance.
A good lawyer will save you a fortune.
Total assets including pensions, savings and equity will be valued and split 50/50,initially.
If you're going to be looking after the children most of the time, the split could be more in your favour.
It could mean, as a basic example, he gets to keep his pension and savings while you keep the house.
It makes no difference if the savings are in his name. It counts as marital assets.
He will be expected to get a job. If it goes to court and the judge will see right through him.
And just because he’s making that’s unreasonable offers doesn’t mean he won’t relent once he knows you’re seeing a lawyer.
He may be trying it on.
My ex was like this and once he got a lawyer’s letter he appeared to back down.
Like your stbx, he quit his job too, hoping to get a maintenance package but he got nothing of the sort !