Yeah, I kind of had it in mind when I wrote my earlier post, but then I realised that Lyla Lerrol would be about thirty years older than Superman if Krypton hadn't exploded, so she'd be like Katharine Hepburn to his Al Pacino.
Which is the very first clue that something is amiss in Alan Moore's "For the Man Who Has Everything" -- in Superman's "Dream Krypton" he's married to Lyla Lerrol, who
should be about as old as that cranky neo-fascist Jor-El. I passed that hint during several re-readings before it was pointed out to me. That internal contradiction should have collapsed the Black Mercy illusion from the very beginning, but Kal's continued love for Lyra overrode his logical thinking.