Random Civs in a Self-built map?

[Enigma_Nova]

As far as I know, the only way to access the World Editor is by starting a game.
I'm in the process of making a map with tactical points and strategy all over the place for a 1v1 game, but I don't know how to let the players set the Civs playing, or how to port my Bismarck/Gandhi map over to any other combination of Civs.

How can I do this? It would suck to copy tile-by-tile whenever someone wants to play as Elizabeth, or Roosevelt, or Qin, or Isabella, or ...

[Andrew1999]

I think your best bet will be to edit the worldbuilder file by hand. Check out the first few lines of one of the Firaxis maps (like Earth) and it shows how they've placed the civs. The Planet map starts with all the player infos empty, so I assume that's how you get a random selection.