If a woman is in agreement with being seduced, (if not it is rape) then that is in my opinion a form of a vow.Research what a vow is. The scripture seems to mention it as a vow to the LORD everytime or be talking about it in that context. We think of this as a vow to a person but I mean towards a vow like a nazarite vow or the vow that the Pharisees took when trying to kill Paul. I have lots of hours into numbers 30 because of marrying Lara without the blessing of her father. He didn't disallow it but wasnt happy. This didn't actually apply anyway because she was living in my household without a proper covering anyway. Also notice its only in the day of hearing for the father, but a husband can break a vow whenever. However if the husband breaks it in a day after his hearing, then he bears the guilt of the vow.
Those are my standards, not anyone else’s.
We aren’t living in a Hebrew culture, so some things are a bit more shaded. In the Hebrew culture her father would have either accepted or denied your proposal, but he would have been a lot more accepting of plural marriage.
I’m not judging your situation. In fact, there are so few righteous men who have raised their daughters to understand ownership that my statement was more theoretical than practical.