>>384795284
Hmm, I'm not sure, though I know in a technical sense how it should work - instead of doing the single drawing-to-the-screen step where the 3d environment is rendered, two drawing steps occur, one with the skybox camera, the other with the player camera.
I don't really use unity, but I'd recommend looking through the documentation, figuring out when the rendering step occurs, and seeing if you can override that to insert your own code, with two rendering steps instead of one.