I can't believe that you've just called Peter Moore the Anti-Christ. Uuuummm. I'm telling your mum of you.

From a technical point of view, what platform could an offshore station
broadcast on, apart from AM, to reach a mass audience! Not disagreeing with
your point about AM, but looking for solutions.

That's the Catch 22. My personal choice would be to avoid radio ships and invest in networks of FM relays throughout the country. Far cheaper and far more efficient at actually getting a real audience!