Phizzy -
I'm so delighted to see you make the connection that your letter IS your exercise of a human right.
Sign, dated, witnessed, and specifying explicitly the actions of violations you will no longer tolerate - I think you have a very substantial legal document to stop congregational persecution dead in its tracks.
Phizzy, you raised an amazing congruent point in your last paragraph ! - thank you so much for it..
The unstoppable knock on effect within the congregation!
Most (I would assert ALL) of the shunning is not really voluntary reaction by individuals but rather is the result of the industrial level coercion from the ecclesiastical chain overhead -bullying to be blunt.
To have legally shed the cult status of "Brother" without ecclesiastic censure will certainly not go unnoticed inside the congregation.
When your loved ones (and true friends) realize that they can now "scripturally" associate freely with you - they will soon appreciate exactly how great a freedom you achieved with a simple well-timed, well-written letter.
If the elders attempt to harass your associates their first and obvious realization will be "....I need to write a letter also - just like Phizzys'" Then their friends get freedom-envy and they think "... I need to write a letter" etc. etc,
As for me and my household, we can almost hear the Watchtower splitting to pieces.