Well, its been done already and even published. See Dudley, Wade. "The Little Admiral, 1939: Hitler and the German Navy" in Third Reich Victorious. Pretty interesting, except for the part where a kindly NCO cures him of his Antisemitism.
Yes, but it is replaced with a hatred of the British. (Antibritishism?) So it's still essentially the same Hitler, but with his rage focused elsewhere; which is interesting cause it gives Albert Einstein the chance to make a bomb for Erich Raeder.