Gonzo-
A willing member of a church that practices shunning is not a human rights victim if he/she becomes shunned for the reasons and in the manner prescribed by their chosen religion.
Acknowledged membership and affinity with any religious lunatics gives said lunatics tacit consent to exercise their ecclesiastic authority over you in complete accord with whatever idiocy you yourself accept and espouse as a member of that group.
"Quitting Quietly" is an approach that I have promoted here for some time for the following reasons:
No one can be denied their right to leave any religion, for any reason and at any time they chose. You are not required to write a letter, to explain your reasons nor to consent to further internal scrutiny or counsel from the group or its representatives.
Send a dated letter to a lawyer or other trusted outsider, stating that you have terminated (past tense) your faith and belief in the group and its religious activities. NEVER allow the elders to convene any type of meeting with you for any reason - the Shepherd the Flock book states that to meet with elders is "... to thus acknowledge the congregations authority over the person."
You are now free, and any further actions taken will be a violation of your right to religious freedom - a right you have already expressed by leaving.
The surest way to show you value your rights and freedoms is to exercise them.
Research the case of ex-Mormon Norman Hancock to see how effective this is.