I've often thought of using a withy with a chod rig, or a chod type rig where I'd normally use a withy. I think the two are pretty interchangeable really as long as its the right swivel for the chod rig. They do the same job, just using a different material. I must say, I like the look of withys. The shrink tubing tucks over the knots nicely, and you don't need to mess around tying neat looking knots in stiff link. Not sure whether the withy would turn as well if the carp took it from the "wrong" way. Really can't think why I think that though. Probably just as good.
Im gonna tie one up and see i cant see why it wouldnt though