[Question] Where should I ask this particular kind of question?

I am pondering a hypothetical scenario that I think is fascinating but quite unrealistic and involves knowledge across a wide variety of fields, of which IMO physics gets the better part.

I’m considering some sites that I know. Reddit has a sub called r/​AskScienceDiscussion but this sub is not very warm to this type of query. Quora has degraded so much and doesn’t even have the option to expand the subject over a length of mere 150 chars or so, which is utterly ridiculous. I’m not sure about Stackexchange—should I post in their physics site? LessWrong boasts that people can ask anything and it aims to be better than the former 2, but judging from what I read, questions almost exclusively focus on rationality, and the reach (the amount of folks who can read it, or how popular the platform is within a population) is small. There’s another option of posting in fora such as physicsforum, but I don’t have an account there so my knowledge is limited about how people will respond.

Thus, my question is a bit meta: what do you think is the best place to post the question? If there’s something better than what I listed, then please kindly enlighten me. Also, I’d like to ask you guys to not be biased toward our own platform we’re standing on. Thanks!