Balance = KABOOMKIN.Goblin Druids
Well they wouldn't actually be druids, only gameplay wise, but visually they would use shredders. Eg. Shifting to moonkin form turns on shredder's ranged weapons like lasers, rockets and sawblade launcher. Shifting to cat activates your shredder's melee abilities etc.
This would involve a lot of renaming but I think it could be easily done. Specs could be something like Demolishing (balance), Lumberjack (Feral), Medic (Resto), Protector (Guardian)