Stellarium is also scriptable, so I was able to write a cronjob that would launch Stellaris in an invisible background window, set my latitude and longitude, set a bunch of display options, save an image of the rendered sky to a file, and then update my desktop wallpaper to that file.

But then I ended up not using it, because I use a tiling WM so I rarely see my desktop anyway lol. It's at https://github.com/Arnavion/sway-wallpaper-stellarium if anyone wants to use it.