George, I'm just glad the problem got solved. When I had identical symptoms, I got as far as swapping the coil and testing the voltage regulator before a guy in my local shop told me to check the fuel supply and that turned out to be my problem. At least a voltage regulator isn't terribly expensive, easy to replace, and not discontinued.
About the expensive tank, remember HD only made (painted, actually) 64 of those things to begin with so it's not surprising that none are on shelves anywhere. But I am surprised that they can't make one to order--maybe (probably) they wouldn't want to but that's a different issue. The tanks are still readily available--all we're talking about is paint and I'm sure it's around,, and I figure there's a pattern somewhere for the flames and emblem.
If you go the Kreem or POR15 route, be very careful about protecting the paint and you won't need a new tank.
And I'd get HD touch-up paint and take multiple pictures of the tank as well. A good custom painter could easily replicate the factory job if it came to that--probably for less than the factory wants, anyway.
Anyway, glad the drama is over.