After much deliberation I decided that I would go with two completely separate control systems. I am very happy with how the modification ended up and have really enjoyed getting my analog cars back on track. The wiring is simple and I didn't take any pictures of the process. I have included a picture of the finished project as I think it came out looking pretty good. If anyone out there is considering this mod you should do it, it is not very hard and has given me back the simple analog enjoyment I was missing.