I love this idea but I've always imagined Thor as being more of a Paladin since he uses lightening. In fact, I think that the Blessed Hammer skill should be reimagined into something that funtions more like shield throw with the animation that you described but that's just me
Even if it just fired two or three hammers in a shotgun pattern that would be cool. Have an enchant like frostfire to make it even more powerful. In this mod where everything moves really fast and is in your face instantly, standing still to caster a spell that swirls around you and misses enemies that are right on top of you will never be truely viable for anything but cows.