Hey guys, just chewed through this whole thread and have something to add. My shop has installed a few of these units from Czech Republic, for what they are, they are quite powerful. Not saying you need all the functions but you could adapt the box to use the Tytronics sensor, ditch the advancer (would have to lock the sensor in place somehow) and have a fully programable ignition curve, rev limiter etc. The box is a bit clunky but it comes with a USB adapter.
https://www.ignitech.cz/en/vyrobky/dccdip2/dccdip2.htm
Instructions are on the page, and have wiring diagrams, setup, etc. Ordering in the past, we would contact them and tell them the application and they will install a curve that will work and get the bike running, and you can tweak it as needed. Box is about $150 plus shipping.
-Cliff