I, too, will say that firstly I'm glad your daughter is doing well.
I, too, will also say that were I in such a situation I would have just admitted to being the father. I used to identify as genderqueer. I'm not genderqueer: I'm trans. But, I like to queer gender roles. Not from a
genderBLEEP point of view, but because I find queering gender roles to be fulfilling and worthwhile.
My son (nearly 23 years old) calls me Connie. My daughter (20 years old) calls me Dad, and I'm okay with that. For me, no amount of hormones, surgery, psychotherapy, or passing will ever change the fact that I fathered two children and had been a husband for 23 years. I can't really bring myself to be unhappy about my past, because I love my family.
But, that's just me. My son brings me gifts of chocolate on both mother's day and father's day. But, I'm not their mother. They have a mother, and she is a wonderful person (even if this divorce is extremely upsetting to me). Some families have two mothers and every thing is just fine. I choose to remain known as the father, even though I am a woman. I'm a male-bodied woman, but a woman nonetheless.
But again, that's just me. I don't mind being seen as the father.