This might not work for everyone, but it might for some.
If a person faces disfellowshipping, the person should MAKE the elders PROVE that they are baptized!
As far as I know, baptism records are NOT sent to Bethel.
Without two witnesses to the event (and the witnesses HAVE to remember seeing the person immersed), and no photos, there would be no proof.
If someone did this, the elders would of course contact Bethel for instructions, but what could they do?
It would put a stop to the elders proceeding with any action.