I took the external route and wired 4 5000mAh Lipos 120x80x6 in series to an adjustable regulator to step it down to 12v, then to a 3A fuse block to handlebar switches to each signal and light. Common ground not using frame! double insulate everything.
tho I'd like a generator to recharge, I have an Imax charger at home. Electric start would be the ticket, but not the BT80 lol. wire the starter from it's own 5A fuse on the (+) line to your switch to starter.
you have a good idea on everything, just we can't get any juice from these CG magnetos. any amperage you take off from it sacrifices the ignition
requires external charging + battery
For lights and accessories why not just use rechargeable AA/AAA's. I use energizer brand all over the house and have saved a lot of money using them. A good charge on them lasts as long as an alkaline Duracell does.
You will not have enough voltage or current to start the engine. Then you would need a robust TCI ignition, a hall sensor with a custom bracket and a battery anyways.
I believe an off motor generator to keep a battery fully charged is a better option. Going on this contraption, https://www.popularmechanics.com/te...power-how-to-build-a-bike-generator-16627209/
Those type generators are cheap and generally weatherproof, also available in compact sizes. Wheel powered or with a belt and pulley??? The system would require a generator, a regulator to control the output, a sealed lead acid battery, some wires and way to turn it.
Someone smarter than I am should be able to concoct a simple set up that could run in either 6V or 12V.