Just do it the way of miles Morales.. You don't take away Peter parker, you invent another character that is hispanic, black, asian etc.
Plenty of other dimentional superman that are black. Use them.
You create something new...
The problem there is marketability. Most people that know of Superman, only know Clark Kent. They never heard about the fact that in some comics, there's a multiverse, where there was a black Kryptonian, who also became Superman, but with a different name. Just like how the bigger movie audiance doesn't know about Miles Moralis.
And, I have to agree with Racehl Weiss when she was asked wether or not she would play a female James Bond. She answered (and I'm paraphrasing a bit here) that she wanted more original roles for women, instead of taking an existing male part and making a female version of it.
I'd much rather see the same thing happening here as well. Not because I have any issues with a black Superman, or a hispanic Batman, or a Jewish Captain America. There are plenty of black superheroes out there to make movies about. Or female superheroes. I haven't watched the show yet, but I heard Black Lighting is great, and doing well ratings wise.
This entire situation doesn't feel like representation to me. It feels like studios being aware of the political landscape and trying to earn money from it. And that's a pity. I mean, I get it. Hollywood is about money, plain and simple. Still, it feels wrong to take an important social/political injustice and earn money from it.
That's why I loved Black Panther. As a movie, it wasn't the best MCU out there I felt. But when I read about all the research that was done about customs, wardrobe and such from many African countries to make the movie feel right..... THAT'S how you do representation. Not by taking something that exists as one thing, changing it and earn money from hype.