Answering myself on the PhysX part. I asked PhysX support, and they confirmed PhysX is available and free on all platforms when used in Unreal Engine. Thus, the binaries shipping with the engine can be used without having to pay a license.
Answering myself on the PhysX part. I asked PhysX support, and they confirmed PhysX is available and free on all platforms when used in Unreal Engine. Thus, the binaries shipping with the engine can be used without having to pay a license.