There is a series similar to that idea, but I can't remember the title. In it, Lois doesn't know that Clark is Superman (I think), but alt-Lois isn't dead. Our Lois marries alt-Clark, then alt-Lois is found, and Herb takes our Lois back to her Metropolis, where she hooks up with our Clark. Lois finds out she's pregnant, and there's the whole thing about "Which Clark is the baby's daddy?" and they finally just decide that it's our Clark's. But, like I said, I can't remember the title of the series, or even who wrote it.
"You take turns, advise and protect one another, even heal or be healed when the going gets too tough. I know! That's not a game--that's friendship!" ~Shelly Mezzanoble,
Confessions of a Part-Time Sorceress: A Girl's Guide to the Dungeons & Dragons Game Darcy\'s Place