You just haven't given enough information for anyone to offer a helpful response.
Is your husband abusive, so that you need to flee for your own safety? That's not what you've described but maybe there's lots you're not telling us.
What you have described is a desire to 'trap' him in the family home, so that he remains local, thus available to provide childcare, which you need so you can work.
Maybe there's also something about leaving him to take sole responsibility for mortgage, debts, admin, to make any decisions about selling the house and to do all the practical work associated with that.
What I do not understand is:
a) How leaving him with the 16yo forces him to offer childcare to the 13yo, at times convenient to you. (And where? Would she shuttle between homes?)
b) How leaving him with the 16yo prevents him from doing a flit. It doesn't. He could abandon the house, move elsewhere and shrug at your inconvenience.
Either he'd carry on paying the mortgage (which it sounds like he's solely or largely responsible for anyway), or sell, or the house would be repossessed. He could sell with minimal effort, from a distance. You'd still have to go in and rescue all the DCs' stuff and provide them both with somewhere to live, if he'd chosen not to do so.
The whole thing sounds a bit like a (very understandable) running away fantasy, combined with an angry, transactional attempt to manipulate him into doing what you want, by putting your needs and wishes ahead of the children's. Which would probably backfire anyway, if he's prone to selfishness, causing you further anger and inconvenience.