Epic War Age (EWA) - Adapted Mod Collection

I have a few crazy ideas that might be impossible to implement.
1. In WOG, there's a script that makes battles more challenging, called "karmic battles." In short, in battles with monsters on the map, several different creatures fight on their side as well. With each battle, the number (and then the level) of creatures increases.
2. "Customize your city." A program that allows you to change the creature lineups in cities. A similar function exists in RTMG, but it's not fully implemented.

Regarding the city – using NCF might make sense, as to replace the recruitable units, there needs to be something to replace them with. But whether it will actually work is another question. It would require a program that essentially creates a mod that rewrites the city building files so that they produce different units, or create mods independently and, when installing, choose one or another mod in the launcher. But then the selected mod will always be active, and to change the lineup, you would have to reinstall the collection – in short, it will probably be clunky, and is it even necessary? (On the other hand, alternative versions will be implemented for all eight cities – it turns out that it's like mods for replacing cities have been built in). I don't know what will come of this.

Added 3 minutes later
By the way, you could include a mod for the Naga and allow users to choose whether to install it or not in the launcher. The Naga are a faction that exists in the game's lore, and in principle, this mod is the only one of the city replacement mods that can be justifiably used in the collection (IMHO)