Interesting thought experiment.
If I were to get 150 million dollars I would not spend two thirds of it on JWs. Important enough as it is there are other issues of equal or greater importance that could use such funds. Oh maybe I might spend a million just to be a thorn on their side but it would be more of a game to me.
As for specifics:
1. Hire the best lobbyists in the world to question and possibly stop WTBTS charity status in as many countries as possible.
Nope, there are other religions which are just as bad and present an even greater threat to the public's well being. For example, Fundamentalist Christians and their infiltration of government.
2. Advertise against WTBTS shunning policies in national newspapers. I would hire the best advertising agencies in the world.
Hardly anyone reads the newspapers any more. Television yes. I would also hire a good marketing agent for advice. I have some pretty good (and dirty) ideas for such commercials and shunning is not one of them. The public couldn't care less.
I would make a TV commercial where a young girl answers the door to a JW pedophile. That is something the public could relate to.
3. Give a million each to well thought out 'apostate; websites such as jwsurvey, jwstruggle, jwfacts, this forum, etc
A little too much even if I were to spend 100 million. More like $100,000 each.
4. Pay for an all expenses paid holiday and accept to be charged at premium senior counsel rates (via my charity of course re tax deductions ), for Angus Stewart (Australian RC) to consult with my team on my new ship for 2 weeks.
Interesting. A market consultant would be more helpful. Angus Stewart might be limited to knowledge of Australian laws and it's the US where most of the action is at. I would give it a try though. Maybe, if he could learn US law,I would use him in a class action suit.
5. Lobby and eventually teach, via charities I would control, to inform pre teen school kids why they should wait until late teens to get baptized.
You're supporting religious beliefs by doing that. Why?
6. Use private detectives to follow GB members and Helpers, to see what they get up to.
Make them paranoid, heh?