unfortunately I don’t know of any tissue that acts like vaginal epithelium in terms of how it alters pH, let alone something that acts like the cervix in producing mucus that feeds lactobacillus - maybe someday they could theoretically grow such tissues in a lab to be used for a graft?

Actually, a uterine transplant has been done before on a trans woman (Lili Elbe),

I didn’t include Lili Elbe because it was a failure, I don’t know of any successful transplant - but it’s a good point that the surgery was completed. Her story is so moving and tragic …