So, basically, assume Italy splits around the late 1940's between a pro-western monarchy in the south and a socialist but neutral (titoist-like?) state in the Padanian plain above the northern Appenines. Assuming the powers agree through a binding treaty that the former state can be a NATO member if it wants while the latter must not possess any Soviet troops in its territory, how would the lack of a western military presence in northern Italy and the Alpine chain affect NATO's military strategy and deployment in Europe?