You might want to check out cyclex. They appear to have an alternator configuration that does not require a battery.
http://cyclexchange.net/Honda%20Cafe%20Page.htmI have not bought from them, nor do I work for them. I just have passion about the CB's as you do.
From the site:
"NEW" Cycle X charging system
* Single phase system allows battery or battery less operation. ( call for details )
* Rotor weighs only 1.640 lb's for high rev potential
* 14 amp system
* Kick only ( who needs a button anyway )
* Complete system weighs over 8 lbs less than a OEM system.