I also think your letter (Kosonen) was more to the point of how to deal with the theological debacle of the JWs, somehow personally.
Rather, the question must be asked: under what circumstances would a protest/rebellion/revolution against the JWs be successful?
A frontal attack by an individual against a globally operating organization has no chance of success unless that individual - either alone or with the help of others - has sufficient resources to wage the struggle. If an individual had, say, a few billion dollars to spend on a media campaign where he could use the internet, TV, radio or newspapers to conduct propaganda against the JWs, and at the same time create an alternative for the "renegade" JW leadership (i.e. convert especially prominent JW members to his side), then there would certainly be some result. The assumption of course is that you use the whole repertoire: from truth, to disinformation, to lies and corruption. The goal of the financial and psychological operation, is to get a "Judas" or several Judases...this is a proven method, but as I say, it costs more than 30 pieces of silver today, because you are not catching some lone leader, but fighting a globally operating church.
The above is a rather hypothetical case. It has several variations, but basically it's still all about money.
A less financially demanding method is when the one who criticizes the church comes up with some attractive, phenomenal idea that forces the masses and the church leadership to respond in some way. This is the method: the "religious reformer". John the Baptist, Francis of Assisi, John Huss, Martin Luther...
Honestly, it's as unlikely a method as using gigantic amounts of money. But still, that's where I see the most potential. Example: suppose someone manages to solve the mystery of, say, the 70 weeks of Daniel. And this, of course, by answering without exhaustion the various interpretations that are available for about 2000 years. Because just because I think something and start expanding on it doesn't mean it's the right solution. We're really talking about unraveling some widely known biblical mystery where there are several competing views. It's not just a demonstration of ignorance...
This interpretation would become so widely respected that WT would have to respond with an article of some sort. The members themselves would question whether it is true. At the same time, they would question how it is possible that someone else knows this (e.g. 70 weeks) and the JWs leadership knows nothing about it. The JW leadership would have to get on the defensive. The failure would have to be so obvious that it would be difficult to lie their way out of it. I don't need to describe it, everyone probably knows what would happen.
However, the "religious reformer" method has a very high bar. It really means extensive research on a topic that must be acceptable to the widest range of people. Something in the quality of the greatest human discoveries and inventions. Copernicus, Newton, Einstein...alcohol distillation 😊, the steam engine, penicillin...
The abbreviation of the method "religious reformer" is only theological: the person in question gets the proper information directly from God. These people then usually raise 3 or 4 day old corpses, heal the blind, the deaf, etc. etc. So even this path is not entirely easy, although it is seemingly the quickest.
I can't think of any other solutions...but maybe I'm forgetting something?