It sounds like a good idea, I would suggest that instead of hanging from the vent hole you could use a steel bearing ring like a bar stool uses and have a rod that extends through the vent hole to turn. It might be a little more cumbersome to put in than hanging but you would eliminate any stress to the vent hole and make it easier to turn, you could put it in and warm up the smoker then hang the sausage and turn as you load. If you try it be sure and post pictures I'd love to see how it turns out.
