Ah yes:
https://www.elektronik-sachse.de/shopsy ... ullet.html
I get the impression you prefer spending smaller amounts of money.
The Boyer Bransden Mk4 kit is supposed to work better with lower voltages than previous versions.
I have also mentioned Pazon before, my fairly brief period with a Sure Fire on one of my bikes was happy enough, until I got the money for a magneto!
Two of my bikes now use the BTH electronic magneto, the FM1R. These need a bit of machining work to the flange to fit the Bullet crankcase but they have proved reliable so far. They are not cheap.
If you wanted a crankshaft-mounted CDI ignition for the Bullet which includes some lighting coils, Electrex World sell complete stator kits, the CDI ignition works without the battery, the lighting side can be used with or without a battery if you use a capacitor, though the lighting output isn't great.
There are others, I'm trying to think of the one which has all the TCI electronics built into the trigger unit which replaces the points, but the name escapes me. There is also the Wassell electronic ignition, but I would avoid those.
Don't forget there is the Indian made Eureka ignition for the Bullet, this still uses the mechanical advance and retard.
A good internet search will reveal others, I found an Australian-made kit which is probably very good, but shipping times and costs may put you off that option.
A.