I don't think it is possible. Kaguya had both powers and they were clearly manifested separately. It's thus impossible to predict what it may look like, since there's no underlying logic from which we could determine the look.

The lazy way would simply be to introduce the commas into a Byakugan.

I said if it was possible, i was implying it was impossible, i was wondering if anybody could come up with good looks for it despite it being impossible, lol you probably just didnt see that part

I did see it. But since there's no underlying logic to such an eye, the design could be anything. It could be a green eye with the Kanji for "rin" for all we know. My guess is as good as anyone's.

oh, sorry if i sounded mean(i am alot nicer then alot of people here arent i), my guess is that it looks like borutos byakugan with 3 tomoe, i made this just for fun, not to be taken seriously

Interesting enough, they did a Byaku-Sharingan design in Rock Lee's Springtime of Youth. Though it is comedy, I would recommend looking into it if that's something you are interested in. Check the Rock Lee's Springtime of Youth wiki for a picture.

i know about that, i guess it could be cool, but i think it would look better blue