This is a great idea.
I'm a former elder stuck mid-fade due to my believing wife.
I would love to send in a letter to Bethel, perhaps hand written, but still anonymous, telling the governing body that I go door to door once per month and am a complete atheist. Why? Because my mother couldn't be seen with me in public if JWs knew what I believe now.
All these letters getting stamped from various towns across the country would be an awesome "witness" to the pain and suffering put upon people by their policies.
We just need to set a date, and get it promoted on all the XJW sites. JWN, JWR, Reddit, etc.