It's been tried, or at least suggested, before. Heesh and Shim, I think, were the subject and object forms, respectively.
It didn't catch on. This won't either. The use of a random letter is even less likely to appeal, especially in speech: "Who? Vee? Who's that? " It sounds like "thee" with a lisp. "Hir" sounds like "her", so that's no use either.
People enjoy using new verbs, adjectives and nouns, but new pronouns are rare, and always evolve over centuries from a related word. "Ms" (see above) is closely related to Mrs and Miss, and still isn't widely used. No one ever says it.
This will never catch on either. Trust me.
Good Morning Thursday 18th April 2024