Go to Dick Smiths and get a simple toggle switch, tape it to the handle bars - but insulate your wires first - you only need the red and black from the ignition for on/off running....not sure about your lights though - does your right hand switch have a light switch incorporated with a DOT, P and L on it ??
PO on mine had three toggle switches mounted on the headlight shell - one for ignition on/off the other for lights on/off and hi/lo beam