The US has a history of being overly cautious about interfering with religious rights, even when there is abuse.
I believe the best action is here is a public information campaign. The public in the US does not get disfellowshipping and they largely see Jehovah's Witnesses as harmless. Apart from the annoyance of the door-to-door work they are generally held in high esteem in the community.
Objectives:
1.) Inform the public.
2.) Give JW's a "voice" to express how policies like shunning have affected them and their family.
3.) Create a backlash of negativity that might pressure Org to backdown on the policy.