Had two restored Mk1's and a Mk2. In all three, I kept the original 6v battery and lamps, starter, generator, cut-off, etc, but added a 12v in the Wireless battery Box,a nd a 6v solenoid to the engine compartment wall. and then disconnected the heavy gauge wire from starter button (mk1) to the starter, and instead, ran a thinner gauge wire (18Ga?) from the starter button to the 6v solinoid. That then passed 12 v directly to the battery to the starter only.
Spun the starter like a top! No damage to starter and I could take a 12v jump from modern cars and other vintage that ran 12v.
Only downside is that the 12v was not in any charging circuit. I would use a charger before the event to top it off. I always took a spare 12v to events that was also the same size as all the other 12v we used, so we could swap around and know they would fit.
The Mk2 was similar, but simpler - just a new heavy cable from the 12v battery to the 6v starter, and then used the manual starter lever.
In all cases, used a quick disconnet terminal connection.
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