Polygamy isn't a must like Mehr is. Its optional. You can't compare key parts of the marriage contract that wouldn't be valid for something that you don't have to engage in.
And yes a man can refuse and a woman can then refuse to marry that man. Marriage at the end of the day is a contract. So no, you can't force women to live in polygamous situations.
My argument wasn't about forcing women to live in a polygamous situation. People end marriages for many reasons. So that was not my argument. My point was, in Islam polygamy is halal if the Muslim men can fulfill the conditions laid out for them. Therefore, a woman demanding that her husband can't take a future wife in the nikaax contract even if he fulfills all of those requirements, that is not enforceable. Man can tell the Shiekh not to document it. And if the woman is gonna walk out the nikaax, that is her prerogative. It is not like she was forced in the first place.