Perhaps, this mod would be a nice pair with this https://mods.factorio.com/mod/corruption/discussion (I consider combination with this mod)

Sorry but this mod is strictly cosmetic and is not supposed to change game play at all, however both mods certainly would be fun to use together!

The concept and further ideas under development. Currently, that certain mod just transfers most buildings to the enemy force. Further realization might be messy due to events and filters. I might add more aftermath moments. For example: destroyed buildings will be rebuilt by enemies, after N minutes near buildings will be captured, transformed with the captured territory for enemies.

For me, it seems a pretty idea to change the appearance of enemies and add more features. Because "robots", "humans" etc can affect players, buildings etc more than biters in theory.