Perhaps a convoluted idea, but it would be interesting if an Lua script could be made to generate a new “new world“ continent each time a scenario is loaded for the first time.
In Europe Universalis there was such a mod - with a random New World, which was created differently each time the game was loaded. However, this mod was not particularly popular. Reason: the banal predictability of the location of nations and resources due to climatic zones. After all, it is obvious that the Aztecs, rich in gold, will be in the tropical zone. In a temperate climate - there will be aggressive Iroquois. Random outlines of the continent and islands do not really matter, it will be funny once, however, the replay value of this mod will tend to zero, as shown by this EU mod.