Thank you for helping me to consider all of the variables in this situation. You're right. To a certain extent, any support that might come down the pipeline belongs to her and may come in handy later in life--even if she only receives it when he's of retirement age.
It also occurred to me that my daughter might resent me later in life for, essentially, enabling her father to shirk his parental responsibilities. How could I ever explain to her why the situation was dire enough to warrant a complete removal of her father from her life? It's one thing for him to choose to not be present, but it's quite another for me to make a deal with him to ensure his lack of presence. I don't want to make a selfish decision that benefits me in the short-term yet potentially harms her or her perception of me in the long-term.
For now, I guess I just have to endure his drama. As usual.