Tri-Spark (an Australian company) do a fully programmable ignition suitable for Vincent Twins and Singles. It is called the FireBox - more info here https://www.trispark.com.au/More discussion here about various programmable ignitions
ET: Engine (Twin) - Programmable ignition
Any one have input regarding user programmable ignitions for twins. Very tempted by the systems available for Harleys, which have several options as standard and also permit you to construct custom parameters which include +or - 10 degree offset from the 45 degree Harley norm for the rear...www.vincentownersclub.co.uk
BTW I have no commercial interest. The listed prices are in Australian $$, so apply the exchange rate for a pleasant surprise