Repairs to the ignition were completed with the aid of Pitstop (as usual). I sourced an ignition barrel from a smaller Aprilia, only the lower portion concerned me, for £5.
Tony was able to wire the ignition back an, with extra solder and the jobs was done just in time for me to fly out of the country and ride a rental bike over the new year in Chile :-).
Back home and the Peg is in use again. Braving the Scottish pre-Spring weather.