When I get a nose full of processing chicken smells, I can't eat them for a few days, and I'm a paramedic, I eat after some "amazing" smells! lol lol lol It isn't even that the smell is that bad (compared w/ my work smells) just extremely unappetizing.
So does the smell mostly come when you put them in the hot water before plucking? If and when we do process the old hen, we will probably just skin her and not worry about plucking.