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This is about one of the eyes i've created. If you dont already know it is when an uchiha member has the mangekyou sharingan and switches their eye with a byakugan eye(like when they gain the eternal mangekyou sharingan).
I want some help coming up with ideas for its abilities but before that i have some more info to share with you.

Have you ever noticed the eyes have different abilities? the right eye seems to control physical elements such as 'Amaterasu' or 'Kagutsuchi'
where as the left eye controls the mental aspects such as 'Tsukuyomi' or 'Kamui'.
They both are used for 'Susanoo'.
so based on these facts I would like to state that without the right eye you couldn't use the physical, without the left you couldnt use the mental, and if you are missing one you can not use susanoo.

In my mind if you were not able to find a sharingan to replace your own and you used a byakugan it would work. This is because it is said that the sharingan was born from the byakugan, I feel like it would work and have new abilities, slowly becoming more like a sharingan but keeping it's old abilities. I also know they could use a byakugan eye because of that mist ninja who has one byakugan(can't remember his name)

I suppose this would work in the reverse, a byakugan user obtaining a sharingan, but that is a different topic.

so far i have come up with it looks like a blood red byakugan with maybe a faded sharingan symbol under it.

This form is to suggest possible abilities and looks.