Not sure where the poop smell and colubrid info came from, but my experience through the years has been that colubrids, with the exception of hognose, really don't smell much at all.
Kings are great snakes for draping over you once they are big enough, but that will take a while if you start with a juvenile.
If you were to go with a male BP, they stay smaller than females, but will definitely be a thicker bodied snake than a King.