So far I love this idea, it's orginal and I can't place the power up dirrectly to any anime or game if you were inspired by another source. Best part imo is the choice of which soul to give Naruto, many a fic would given him the soul to protect saying some BS about him wanting to protect his precious people.
Which is true, but is also a lesser part of his being, he wants to live and survive more then any thing he wanted to survive even before he had a precious person to protect. Even his goal of becoming hokage is for others to like him, and thus stop trying to kill him and thus bettering his chance of survival even if indirectly.