I think it is out of the question myself. In the book of Revelation it still connects satan to the serpent. Actually it indicates satan is the serpent in question. But if this was simply a snake satan used to communicate through at the time, why is the book of Revelation telling us, not that the serpent was simply used by satan in the past, but that the serpent was satan in the past?
Revelation 12:9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
All of this speaks of just one entity, not multiple entities. And it clearly says that satan is that old serpent, and not satan used a serpent in the garden to do his bidding.