Hi Gavin
Have you tried dithering?
I think the idea is to move the camera frame a little between each capture say by the width of a couple of stars in order to "distribute" the noise.
Also I dont know if what I suggest next is ok but mask your main object and stars and darken the background...I imagine there will be better ways we will discover later but that may hide the noise that annoys you☺
In any event try to focus somewhat on everything that is going great for you and dont let a little noise worry you...I suppose if you have the object masked you could experiment with blur as well.
Anyways keep on turning out these great images.
Alex
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