Um how much do you know about wireless networking... that dosent sound easier to me. at all. Actually I dont think I even understand what you said. Whats your strategy? Multiplexing all the buttons into one wireless channel using your own made-up protocol and then converting it back to button presses on the other side with a PIC, then feeding that through another actual controller?
Or were you going to use 14 different wireless transmitters?
If you can find a module that acts as a transparent link between two points (transparent meaning that it sends/receives exactly what you put into it as if it wasnt there), then there is absolutely no need to try to do anything fancier than directly hooking it up. And you definitely are going to have to buy some kind of module - no offense, but if you dont know how a potentiometer on a controller works, you are not going to be making your own homemade transmitter. It is a very very tricky thing to do, even the shape you make it matters.
Also AFAIK the buttons arent analog anyways. And first party controllers do not use potentiometers. Third party ones do though.