Hi ReallyLost. Interesting.
Well, your emotions are incredibly strong right now. I can see that you are trying rationalize the potential of this relationship. That's human, and we've done it to some degree in our lives.
I was once engaged to a JW woman. Uh-huh, and trust me the person can promise you the moon and the stars (promise but not deliver).
The thing with any JW partner with an unbeliever, you will be sooner or later exposed to a whole lot of REALITY in regards to what associated members of her family believe. There'll be some genuine attempts to conform you. Believe me.
If you cave in to one belief to saciate her, then it'll be another. It never ends at just ONE. Right now your heart and mind is heavy with her.
The decision you make could be the best for both of you, or otherwise. I think many of the suggestions offered on here, are all constructive and well-meaning.
My mother said something to my brothers and I: 'there are over 5 or 6 billion people on this planet, and you'll never live long enough to meet everyone, don't just settle on the first one you meet...you have choices'
I think that that is sound advice.
Keep your wits about you, and your emotions in check. I hope you make the best and most wise decision.