Here's one. In the I-N section, perhaps, Lois could be told that Clark is a different superhero. I know you covered that some in Blind as a Bat, but if you think that it would work? This would be in a U where A Sister Should Know, etc. didn't happen.

Another possibility is doing something with Bruce Wayne and a (girlfriend?) where someone thinks he is Superman.

in response to Laura, yes and no. The "F" thing is in reference to a series LaraMoon was/is doing with each successive story having the next letter. It started with a 20-minute challenge response called A Sister Should Know, then Blind as a Bat, etc. There have been five stories so far so the next one would start with...

I think, therefore, I get bananas.

When in doubt, think about time travel conundrums. You'll confuse yourself so you can forget what you were in doubt about.

What's the difference between ignorance, apathy, and ambivalence?
I don't know and I don't care one way or the other.