The question arose because someone asked me if the word pratibhū will have alternative forms similar to forms of subhrū, like subhruve/subhruvai etc.  After thinking further about this question, I came to the conclusion that since we typically use the word subhrū in feminine, it has those alternative forms similar to matyai/mataye, but we typically use the word pratibhū "guarantor" in masculine, it will not have such alternative forms.  However, if for some reason, this guarantor happened to be a woman, then we could get the alternative forms like pratibhuve/pratibhuvai.  I have not seen these forms in actual attestations, but in theory, this is my understanding. Does it make sense?