Here is a thread that discusses strategy against the Watchtower.
http://anonnews.org/press/item/1656/comments/#c-40937
I would suggest consolidating ideas first into something that can be used easily, before posting them. One concern I have is that Anonymous will want credit for this, especially if they hack any of the official sites. Your idea might be more effective, but they will probably want to do something that more dramatically proclaims the success of Anonymous.
Your idea about emails might be more likely, especially if you can produce some samples that can be copied and pasted.
You could think about producing an html web page that would contain your idea but have a message from Anonymous after you scroll down. It could say something like, "Just joking. We are Anonymous and we hacked your site because you have consistently refused to protect children from pedophiles. We will not forgive, we will not forget, expect us!"
If you post a file that can be uploaded after the site is hacked, it's possible that the person who does it will choose to use it.