It’s not a matter of trying to record without stereoscopy, stereoscopy it’s a feature required for our projects, we don’t do just simple 360, we do high quality stereoscopic video, and we need to use it in stereoscopy, not in a simple plain 360 without depth 
So in Unity I could enable the sphere in a layer, so the left camera could see just the left sphere and the right camera could see just the right sphere, but I don’t know how to do that in UE4
Cheers.