I think if you have a strong enough battery and a using a light thats not pulling much juice that is not in use all the time you can probably pull it off......you have the recoil to fall back on at least. for ones with lighting but no rectifier or regulator in the system they would use a 611104 alternator, wich was a 3 amp DC (for the charging, and a 5amp AC wire for the lighting. but from what I have seen they were usually always paired with a 5 magnet flywheel and yours is probably only 3 magnets so not a strong a field.
I have basically the same 3amp DC alternator/flywheel/ and 12v starter sitting here right now that you have on yours. I just pulled it all off a 10hp craftsman/murray 30" rider mower that was getting scrapped, was planning on stealing the magnets and alternator for a smaller engine conversion, but I have spare magnets and parts right now already.