Not a Catholic but fairly knowledgeable about the religion. I believe your transition would be accepted as long as you don’t live in sin by performing any acts of sodomy. The Catholics study theology relentlessly, and I’m sure they already had a way of dealing with the fair number of intersex babies born without dooming them to a life spent in unintentional sin.
The church has never expressed an issue with homosexuality, only homosexual acts. And even those acts aren’t a sin due to the homosexual intent, they’re a sin because of the sodomy.
Remember though, sodomy is a blanket term here for “sex acts not capable of producing children” so for you that would be… All of them I suppose.
I suspect that the suggested answer would be the one they give to all gay men, for you to live as a man, but be celibate. Devote your life to God, maybe even become a monk back in the old days. A lot of monks were “confirmed bachelors”