moshe:
Your posts are usually better than that. Usually, you have a chazal whose strict reading favors you. Judaism doesn’t recognize such a “contract” to support in learning for 5 years, as binding on the wife. And your comparison to wanting another husband is not accurate, since the issue there is not the agreement, but the issur.
Also, if you look on the Starbucks thread, you’ll see I invoked you and found a perfect place for one of your signature comments.