I think it would be simply enough to desaturate the wide shots of the sun from space to a near-white, and even the sun already looks pretty white from the surface of Starkiller, so you wouldn’t necessarily have to change it. You could just argue the atmosphere makes the sun appear a little yellower from the surface.
If you’re using Restructured as your basis, you might also want to desaturate the reversed shots of Hux looking at the draining as well maybe?