Thank you for all your comments.
Unfortunately, I don't have time for a project like this at the moment, but I would be willing to consider it for the future. I would also be happy to support someone else who would like to try this.
There is already a lot of good information about this topic and some great ideas for a possible future publication.
I thought I would elaborate some more about my specific ideas if I end up working on this.
I would make current, believing Witnesses my focus. Although, I would want to help those who are facing a judicial committee, my main goal would be to provide access to the elder's secret rules. Although, the Watchtower Society is able to block distribution of the Elder's manual due to copyright, it's my amateur, nonlawyerly opinion that a booklet that makes use of appropriate fair use quotes from that book should be safe.
I think that a well designed booklet would be almost irresistable for some witnesses. Ideally, it would be nice for current elder to put the finishing touches on the booklet and express his opinion that the publishers should have access to the information so they can prepare themselves. (Of course, he should protect his identity.) I don't think it's necessary to criticise or have a negative tone. The quotes would mostly speak for themselves.
The final document could be shared on document sharing sites and even printed. If it's small enough, it could be hidden in Watchtower publications in the library or the literature counter. It could even be designed in a way that it looks like an official Watchtower publication.