Annulment no, questioning validity of baptism yes. You can casually speak to others questioning validity. I was told for example by last elder to go over questions with me I should not get baptized but I went ahead and did it, so I went against direction of “spirit appointed men”.
second, as I was sitting during baptism talk I suddenly realized I had not said a prayer of dedication and I became flustered, confused, embarrassed, and in the end I could not vocalize a “yes” to the two questions asked. I was 15.
i have related these facts to others including elders, and remain untouched and unshunned for the most part.
Use similar facts even if false certainly would help to make elders throw up their hands not knowing what to do. They certainly can be advised that they have no business butting in between a vow made to god as I have verbalized when an elder insisted my baptism was valid in the eyes of Jehovah.