there's no reason you can't animate in layers. I find that easier than trying to do it all in Daz or Unreal, use them both for their strengths. For example, animate your characters in Daz, and animate your backgrounds In Unreal. Combine your layers in whatever NLE system you want, Blender can even do basic video editing now. Think of it as using a virtual "green screen". It saves a lot of time with rendering, and you get the best of both worlds.