Is there a way to add a step in the game creation before starting the game?

Modding
1

I would like to add a step in the game creation where you can input a value that would change the values in these mods

https://steamcommunity.com/sharedfiles/filedetails/?id=1475278274
https://steamcommunity.com/sharedfiles/filedetails/?id=1475223619
https://steamcommunity.com/sharedfiles/filedetails/?id=1475060125

instead of changing the values with a bat file outside the game I want to do it in game creation but I have no idea how or where to even start or if its even posible