H zound, What is your objective of your peaceful protest? What would be your ideal result? Are you trying to plant seeds of doubts in JWs (or Bible Students), are you trying to attract news media attention, or something else?
Since I checked out CCMC from my local library, it may take me awhile to read all of page 179 to understand Steve Hassan's objectives for "picketing, demonstrating, or otherwie exposing a particulars groups activities". I do feel after reading your excerpt from page 179 that Steve Hassan would not recommend protesting at WTBTS DC's/assemblies to plant seeds of doubts in R&F JWs [especially "Spiritually Strong" (non-thinking) JWs]. I base my opinion on other parts of CCMC where Steve Hassan relates how his father tried to convince him that Moon was full of it because Moon's organization owned an M-16 factory in Korea and Steve Hassan did not believe his father.
By the way you asked JWN members about what slogans to put on your sign, why not ask Steve Hassan by contacting him through his email contact form on his website at http://freedomofmind.com/Contact/index.php. I have contacted either Steve Hassan or his employees several times asking for him to sign White House petitions to remove tax exempt status for non-profit organizations that are dangerous cults to asking when CCMC will be published as an ebook or in another digital format. I have usually gotten a response within 2 business days.
Peace be with you and everyone, who you love,
Robert