Enhancement shaman, retribution paladins, and frost/unholy death knights all fill the magic warrior niche in this game. If it’s really, absolutely, super-duper important to you that the magic specifically be Arcane…
Well, sorry. But you’d be hard pressed to implement another battle mage in this game’s mechanical paradigm without stepping on one of those specs’ toes.
I suppose you could try evoker and just really dedicate yourself to standing in melee and casting Azure Claws or whatever that ability’s called.