Well, it could be that Evangeline, with her powerful magic, trains Naruto in a different way. Maybe she imparts some unique magical skills to him along with his ninja training. Naruto might grow up with a different perspective on power and friendship.
The plot could involve Naruto being raised in a place where Evangeline resides. She could see the potential in Naruto and decides to raise him as her own. Naruto would then have to adapt to Evangeline's rules and way of life. He might learn how to use his chakra in new ways because of Evangeline's knowledge. Also, his relationships with other characters like Sasuke and Sakura could be altered as he now has a different upbringing that makes him a bit of an outlier in the ninja world.