While some of those are interesting ideas but I think if you’ve got to justify it as an ongoing outside the main earth- well, I think only one of that maybe goes far enough. But to be fair, it’s a really good one. But as for the others, well...
I’m gonna guess some of the other details would be in the ballpark of on one earth he gets his powers as a baby as soon as the Kent’s find him and the other not until he’s a teenager.
Or maybe on one earth the ‘S’ stands for hope and the other it’s the crest of El or just a regular ‘S’
Yeah those are all just details man. You gotta give it a hook, ideally something new and juicy. Maybe make it a time piece or have someone other than the Kent’s find him. The one idea there that has some meat to it is the cyberpunk thing. Go full cyberpunk 2077/BladeRunner/Altered Carbon dystopia. Now that could be interesting, I have no idea how Superman would fit in a world like that, but I wanna find out, I think that’s a promising hook, after that you can totally throw in stuff like the Daily Planet/Daily Star, different love interest, different costumes.