I have been over this same question with a BSA . From all the onfo I have gathered , there seems to be field coils that will retrfit the E3L dynamo as well as an armature , to accomodate 12V electrics . This also seems to put out less current , from what I am deciphering , and needs more RPM?? I dont know if your bike has an E3L or not, but after all i have read , I am confident that 6 V system , with a healthy dynamo , will do the job just fine. As far as uprated electrics , my bike is fitted with a Lucas
mag so the dyno is only responsible for lighting, I am counting on the stock headlamp and I have a couple of the pos ground led tail lamps from bulbs that last forever , these should save some current draw and be a bit brighter ?? I am also contemplating using a solid state rectifier that is offered for the older H-D machines , I havent ooked into them yet , but they sound like they will save on some trons and be smaller, more reliable in the bargain .
This is all based on theory and conjecture , I have seen all of this work on various bikes , with the exception of the regulator I mentioned , so I have some confidence with it.