When I visit this forum, I'm always a bit surprised by those members who, on deciding they no longer wish to be a Witness, write long letters to the elders, set out their reasoning in e-mails to family and friends, attend judicial meetings to have their say etc. I've never heard of an ex-Catholic, for example, writing a resignation letter to their parish priest.
I'm a never-in so I can't appreciate the emotions these people are going through. However they also often say a big worry is loss of contact with family and friends. I would have thought that 'grand gestures' of this type are bound to precipitate a crisis, probably leading to dis-fellowshipping and the disgraceful shunning practices that this site's topic boards are full of.
Although it must be really tempting to speak your mind, wouldn't it be better in the long run just to fade away? Gradually reduce attendance at the KH or even better move house if possible and don't bother attending the new congregation, get a new job if your boss is a JW, develop friendships with a few non-JWs, be evasive with family and let them gradually come to terms with your departure without the fireworks and negative reaction that a big announcement will get.
Perhaps this fading approach won't always work (and I'm sure someone will tell me if it doesn't!) but as an outsider it looks the best option to me.