If you do this and they decide to DF you anyway and announce it, I highly doubt you would be successful in a lawsuit, and I am unaware of anyone who has been. Some bodies of elders, anecdotally, have decided not to make an announcement out of fear of personal liability and legal costs, but the chances of an actual successful lawsuit are slim to none.
Actually, they did that to one of our members, Kwintestal. He hired a lawyer, had a letter drafted saying that they needed to show what grounds he was DF'd for (there were none), or REVERSE their decision.
[ EDIT: Now, I would have to ask, but I don't believe he wrote a disassociation letter ....... you may find it here, if you look at his threads. ]
The DF was reversed. And he is someone I know in person, and well - I watched it unfold. But this is Canada, and there was no lawsuit. ;)
I know, that was amazing! But ,,, all BOE's may not respond that way.
tal