Dam,
I hope you are successful with the ss regulator, it would be a nice upgrade for an old skool system.
Today they do a lotta neat stuff.
The old ford flathead guys are getting a 12V (or 6V) Alternator built in what looks to be a plane old 6v. ford generator housing, sitting right in it's proper place on the engine.
One has to look close see it is not a plane ol' generator.
A wolf in sheep's clothes so to speak.
I guess if there is a need, and quantity is there for profit, it will be filled.