Basically everyone agrees that they are in character when in the thread, and they can argue about things using arguments that have very obvious logical fallacies that they know to be false (the definition of trolling). Personal attacks, whether in character or not, would of course not be tolerated.
I agree, though I don't think "trolling" would fit it. Rather, focusing on debating various themes, but instead of using logical arguments, using the aforementioned logical fallacies. For instance, completely switching stance, making up "facts" and statistics or other thing.
Unsure of whether or not it would work though, but I don't think a real troll thread would work, considering your intentions are clear, and a good troll isn't a blatantly obvious one.