Lynxara
Nice post!!
I don't think you'd need to add in the "unknown element" kludge to Steve's shield for the movies. You get a much cleaner unified setting if you just make it out of something that is synthetic, rare, and totally awesome. If my call on Tony's supermetal being vibranium is correct, then probably the only bits of it will be Tony's reactor, Steve's shield, and maybe whatever is obtained by the first villain to use it (Klaw?).
Now, tbh, I like the idea of Tony creating vibranium much more than it just... existing in Africa for no reason. Vibranium does things so bizarre that it really does resemble (metaphorically, anyway) the synthetic chunk of the periodic table more than anything that occurs in nature. Vibranium being synthetic also explains why it's rare better than "Black Panther only lets you have it if you ask nicely."
I honestly think you don't need the vibranium stuff to make Wakanda or Black Panther really interesting. Wakanda's actual storytelling hook is "a country in Africa so awesome that it was never colonized and also its ruled by a black superhero who's like The Phantom without all of the unpleasant white man's burden themes and a much better costume." That's a whole movie by itself that suggests all kinds of interesting themes and plots.
Now, tbh, I like the idea of Tony creating vibranium much more than it just... existing in Africa for no reason. Vibranium does things so bizarre that it really does resemble (metaphorically, anyway) the synthetic chunk of the periodic table more than anything that occurs in nature. Vibranium being synthetic also explains why it's rare better than "Black Panther only lets you have it if you ask nicely."
I honestly think you don't need the vibranium stuff to make Wakanda or Black Panther really interesting. Wakanda's actual storytelling hook is "a country in Africa so awesome that it was never colonized and also its ruled by a black superhero who's like The Phantom without all of the unpleasant white man's burden themes and a much better costume." That's a whole movie by itself that suggests all kinds of interesting themes and plots.