If the baptism is denied, what would preclude the couple from baptizing the baby themselves, at home. The Church would be required to record it, etc., if they report back that the did so, yes?
Seems silly. “Raised in the Catholic faith” doesn’t equate to “raised by two parents who 100% subscribe to everything the Church teaches, and follows Church teachings 100%”. How many parents, is it reasonable to assume, have their babies baptized while, as a couple, they are using artificial birth control to keep from getting pregnant too soon after the birth they just experienced? I would say the percentage is quite high.
A gay couple can raise their child in the Catholic faith just as well as a heterosexual couple can. They can explain Church teachings to their child, and everything that comes with it. I get tired of people worrying about appearances. None of us is perfect.