I'm really not sure what you
I'm really not sure what you mean by a "2nd party managed charge source"?? As far as I know, most BEV charging is done at home, usually overnight. To me that seems a lot more convenient than going to a gas station.
I'm looking at hydrogen cars and wondering why anybody would want one. What is the selling point? It looks like they only offer limitations and higher costs relative to gasoline cars. Meanwhile, I can buy a BEV today with blistering acceleration, free fast-charging at a network of stations across the country, and the ability to charge in my garage and start every morning with full range. Hydrogen cars, as far as I can see, are promising none of those things.
It's not enough to say that hydrogen is technically "viable". You have to come up with something car buyers want, something they prefer over the available alternatives, and I don't see how that happens with hydrogen.