The Animations are already in the game though. For example it wouldn’t be hard at all for them to use the UH Death Coil 2H animation for a 2H frost Howling Blast Animation. Also all the other Animations are already in the game, it’s simply the difference between using a 1h and 2h combat. You can check WoWhead Dressing room and see for yourself if you’re not convinced.
Unless I’m missing something this wouldn’t be an issue at all…