I got confused by this:
How far would he go to get Lois back? Would he outright lie about who Superman is? Really, who could disprove him?
The way you phrased it, I wasn't sure if you meant would he lie about who Superman *isn't* (which he kind-of does every day, and got about as close as he could to the line without crossing it in the episode with the laser hologram and then again in Sex, Lies & Videotape) or, would he lie about who Superman *is* (like saying he is Ralph or something

)