Thank you for your opinion. If we will decide to start development Atavism for UE4, we will for 100% do it by building a separate team. We will keep the progress which we are making In Unity area.
This is already possible. I mean you can implement any model to your game based on Atavism, without coding. Here is how to implement new character model https://wiki.atavismonline.com/project/character-model-race-and-class/ or how to integrate your existing scene (environment) with Atavism https://wiki.atavismonline.com/project/integration-into-existing-scene/ and there are much more tutorials on the wiki related to different aspects of the Atavism.