Making a mod to insure there will be no ruins seems like overkill (but if, like the Balance Mod, the mod is not needed by the players, what the heck, right?).
But, all one need do is follow the same steps I do when creating a game:
(1) Start SE4
(2) Turn ruins off
(3) Generate whatever type of map you want over and over till one looks interesting
(4) Save the map file
(5) Exit the game
(6) Load map into Map Editor and set starting points
(7) Save and exit
(8) Start SE4
(9) Load the saved map
(10)Load an empire with Ancient abilities and start a dummy game (and look under Special).
Steps 8-10 take less than 2 minutes to do. And once the map has no ruins on it, I don't think generating a game with the loaded map will cause ruins to suddenly appear even if the game has ruins turned on. But, I turn it off anyway (as added insurance)
.