If I were you I would fit a Lucas RITA system, from Mistral Engineering in the UK. Mine's been on for 25 years and not been touched. If you want to stay original, Vee Two used to do an exchange service, or Ducati Kamna in Germany have modern replacements available.
Have you spoken with Phil Hitchcock at Road and Race in NSW? Pretty sure Phil supplies re-conditioned ones, or will recondition yours - he may have new ones too.
(Btw, they were also used as Pantahs ... and contemporary Laverdas. And since we Laverda boys like to install a modern system which does away with the Bosch pick-ups, that's another way of finding some ...)