Sorry, Seppuku, but I have to disagree with you on this one. The Genesis account of the incident, (Gen 3), specifically mentions the snake (ha nahash in Hebrew) and there is not connection there in the text with any other character. This incident is about the wiliest of the animals, who incidentally, spoke the truth about eating the apple whereas god had lied about them dying.
I even don't think there is a concept of devil in the OT at all. The only mention is in Job where the word satan comes with the article and means the accuser and is not a proper name at all.