Hmmm ... as a GM, I'm always a bit hesitant to mix and match two different templates, but I not only have no problem with this, I personally think it's a wicked idea.
Mind you, in the case of both a White Court Virgin and a Changeling, a decision needs to be made somewhere down the line which direction you're going, although in this case, we now three possible outcomes instead of two! Human (playable), White Court Vampire (playable), Full Fae (not quite so playable).
Let us know how it goes