lets say you get disfellowshipped.
then move 1000 or more miles away.
how would the elders find out if you're df'd if you do the following:
go to a local kingdom hall, ask for a bible study..... when asked for name change the first name slightly, then get re-baptized 4-6 months later.
do elders run your name through a list? I don't think so!
you would be a witness in mgood standing, just don't tell about your previous location details!