Stingdragon
I think the Kochanskis would get along in the beginning. Talking about opera and such things.
I'm not so sure I agree with you there. The old Kochanski might have been ok, but the new one is so brittle that she wouldn't last five minutes.
Kryten wouldn't make it with himself because he would get mad at the other one for stealing all his intelligent observations. It would turn into a contest.
Lister. Well, at least he wouldn't be able to impregnate himself again. But no, it would never work. Two Listers trying to annoy one Rimmer. Nope, they'd be fighting over him to keep their sanity.