I was able to find a bicycle brake cable sheath large enough to hold the 2 wires. It is important that the teflon be removed so that they won't bind when rubbing together. This is the one part of my idea that I don't like so much. I would love to use a dual channel cable so keep the wires seperate, but I can't find any so I have to use a single hole cable. Seeing how little this control is used (at least by me) I still think the cables will last a long time before they cause any problems. The stainless cables are real smooth and slick so hopefully it will last.
The brake cable sheath I found is slighty smaller in outer diameter so I wrapped it with tape to build it up to the size of the factory cable sheath.
I also found some plastic tubing with a 1/4 inch inner diameter that works real well for like 2 bucks.
I also made sure the edges where the cables go into the sheath are not sharp so it won't get cut in any way.