Kooky Key sigs

When transposed from concert pitch to sounding pitches, the sax part (which is in C minor, plaing pitch) is given the key sig (3 flats) but with all three flats in the piece marked natural. Obviously, it works for playing, but I wondered if I can change the key signature for JUST the sax??? (remove it, making it C) without wrecking the whole score. I think that iwll be may last problem for a while. Thanks for all the support!