Edit: just trying to reply to you here
I think there’s some confusion around this “no post processing”. They have said that you can use the movie render queue with any of the media export options laid out in the documentation:
So essentially exporting a bunch of PNGs or EXR files but then you have to put those images together in a sequence. Unreal cant do that so you do need to use another software the original images are all encoded from unreal so as long as you dont mess with any of the visual stuff in post I think this meets the requirement. My audio was added after exporting from unreal. I dont think this goes against the rules as the visuals are the same, they just want to SEE the same end product as in the editor. I can do a screen recording directly from the editor if need be.