I had an idea the other day for a physad who only uses knives and throwing knives in combat, and in fact is under a geas restricting him from using any other weapons. Key adept powers include Improved Ability: Blades, Improved Ability: Throwing Weapons, and Improved Reflexes. What other powers should I consider? Missile Parry, Power Throw, Cool Resolve, Great Leap, Wall Running, Blind Fighting, Combat Sense, and Motion Sense are all thematically appropriate. Would it be better to take the geas at chargen as the negative quality in Street Magic, or as his first initiatory ordeal? Is the Attunement (Item) metamagic preferable to using a knife weapon focus?

Is such a character even viable, or am I totally off my nut?