How to add a sun disc to custom sky sphere?

Hello.
I am trying to recreate my old Unity project in UE4 right now.
Pretty much all of the game is situated in space (on the Moon, to be more exact), so I needed a skybox with the stars, Milky Way and so on.

So I created a custom blueprint with static mesh component with SM_SkySphere mesh and applied to it my material created from my .hdr sky texture. It looks nice, except the sky disc is missing. I know that the sun is added to the scene by the Atmospheric Fog, by if I add it to the scene, the sun is behind my sky box, meaning that I can not see the disc itself.

So my question is how can I add a sun disc to the scene while using custom textured skybox?

Scale your SM_SkySphere for about 10000 times lager,and you will see it.