Not sure about that, is that the case with the splitfish? If its chipped by Microsoft also that would not work but even then I am not sure about it. Really depends on the contract which you haven't seen so far. Its licensing and nothing about exclusivity. If logitech would license a mouse, you think it would be not working on PC? I doubt it wont.
Even if you have to make the Xim console specific, then good for you, you sell more XIM5. If there are some real benefits the user base will accept it.