Yes, he can use the Shadow Clone technique, but not enough times to defeat fifty of Madara. You don't have to "rationalize" the opponent because this is fifty "Madaras" meaning there are that amount of him. Each one can make a Perfect Susano'o easily.This scenario is set up so Naruto can used shadow clones while he has the fusion avatar up, so I take it that several fusion avatar clones are in the conditions. You're rationalizing the clones, but not the PS. Now, if shadow clones were not brought up in the OP, then I'd certainly would say Naruto looses.