Occurred to me while thinking about Nicola Scott's Action Comics 1000 cover:
I was thinking about how she went with her own Earth 2 Superman design rather than Rebirth or Reborn as the example of trying to refine the principles behind the New 52 armor into something more workable - a fair enough choice in my opinion for her cover - and I realized that guy's now entirely redundant to the 'local multiverse'. As presented he was clearly meant to be Classic Superman relative to the guy we were seeing in Action Comics/Superman/Justice League, but now we have Classic Superman again in the driver's seat. Even given he's dead, his symbolic role is taken.
In that case, I was thinking about Sacred Knight's old proposition that the New 52 t-shirt and jeans dude turn out to be the resurrected pre-Crisis Earth-Two hero, and a modification seems in order. Since the JSA seems to be returning to the 'main' DCU there's little reason to reboot Earth 2 past where it was left off, but at the same time that already had a reboot at the end of its own book, making room for some tweaks (I think it had the pseudo-JSA as the first heroes, but that kind of defeats the setup of the entire thing, and I think memory tampering was involved in-universe, so I'd just have everyone's memories of the Trinity come back with time). In that case, if classic Superman is the main guy, might as well flip it and reimagine the late Earth 2 Superman as the t-shirt Golden Age rabble-rouser, as per benefiting his heritage, who grew up to wear the Scott costume, raise Power Girl, and ultimately die saving the world from Darkseid alongside Wonder Woman and Batman rather than get an ending as cheap as Final Days. If you wanted you could even revise it so that the original Batman/Superman arc still happened, but with the young out-of-control Earth 2 guys meeting their more seasoned Prime Earth incarnations.
It'd largely be a spiritual gesture, since the premise of that Earth demands he be dead in the present anyway. And I want far more of that guy's life and times incorporated into the main version anyway. But since the version originally presented by Robinson/Scott/Pak/Lee/Levitz/Dougherty no longer has a purpose, it'd be fitting to bring the lost Superman meant to capture the Golden Age spirit to the traditional home of the Golden Age takes, and a provide the validation of keeping that guy as part of the history of a 'major' Earth.