I done some UWRC Controller in the past.

Look here for my current Collection. It rules, because its great to have wireless original Controller in you hands and its crosscompatible. You can play eg. with the NeoGeo Controller @ NeoGeo Console, or @ Sega Mega Drive, or @ Super Nintendo, or @ Sega Saturn.

Other way is possible too. You can play with a Sega Saturn Controller @ NeoGeo Console, or @ Sega Mega Drive, or @ Super Nintendo, or @ Sega Saturn.

And you are free with controller and console

I used a extension Cable for Mini Din 8 to make the UWRC-RX PC-Engine Reveiver.

Here you can see some pics.

Next step is to use a black box for the Duo Receiver