Yes, of course. My previous post was just a quick concept statement in reply to someone lamenting that civ VII robs you of choosing your civs and opponents. I'm aware it's not just copy/paste to create the beloved San Marino mode (I think this name will stick with me as description of the forever-one-civ-concept). You need to create a blank generic civ (without any unique civics, units, buildings, and wonders - or include placeholders for these if the game doesn't allow to leave these blank) per age and then copy paste names/icons from the other civs onto multiple copies of that blank civ. Still, it's doable within a week of release, I assume, especially if the demand is high. Later versions might have more elaborate civics for example, or fantasy units, like the infamous Egyptian "Eagle Wings" flying spearmen, unlocked by the "Ptolemaic Legacy Myths" civic in the middle of the second age.