Unlike child support, spousal support is often very difficult (if not impossible) to modify after the divorce is final, so getting it right the first time is a must!
I don't know if your state is one of those that considers college as something you can force the other parent to contribute to. Most do not. Your best bet, since he's not addressing it, is to hold out for the maximum spousal maintenance/alimony award possible and put a large portion of that aside on your own in case he fails to contribute to their school when the time comes, and of course work very hard to make certain he keeps a fun relationship with the kids through thier lives till they're starting school so that he feels involved enough that he will naturally contribute to thier school even if it's NOT because you forced him to do it.
Generally, it's a bad setup for the relationship between parent & child for the poorer parent to be able to tell the child that hse forced the richer parent to contribute to their college, and that the kid doesn't have to stay in contact or even discuss college with the other parent becasue that's been taken care of. BUT if the richer parent voluntarily agrees to do it, such that the poorer parent can't make those kinds of implications in the gazillions of opportunities that will come their way over the lives of the children, then it's good for the parents who are able to do so, to start a college fund for the kid.
On the other hand, if there are zero college funds accumulated during the marriage, if you always spent everything & never saved for college, then why do you think that he should be required to start saving for college now?
I'm not saying I disagree with you, but I'm giving you the higher earner's NCP's perspective on this and this would be part of the explanation of why most states are not requiring college to be resolved by the parents at the time of divorce, leaving it to each individual parent at the time of college.
There are some bond & scholarship options that only exist if one or the other parent is not contributing, and it's often a good idea to make the kid be responsible for discussing it with the parents each separately to find out his budget/scholarship/loan options.