I'm not interested in what might be evidence to some people. That's as much as saying you don't have evidence or you have to already believe in order to see the evidence. That's circular reasoning and not objective evidence.
No one has presented any evidence of a caught demon to show anyone to my knowledge. Not even in a ridiculous, condescending sort of scenario that you describe.
You should read my posts where I have made no claims denying or accepting demons. It is those that claim evidence and the evidence that I ask for. Sadly, as here, none is ever forthcoming. People that claim so much about demons can't even explain why they think that they have seen them or their actions.
You can just say you believe, but don't have any valid evidence. That's OK.
Exorcists in the Catholic Church have been recording them since video was invented.
You need to petition the Church to view any of them (most petitions are denied) because they don’t release them publically.
But if you want to see demons levitating people, making them throw up everything from frogs to nails, speaking in ancient languages then that is your safest bet.
If you don’t have access to the Catholic Church or their exorcists trading facility then your next best choice is using a Ouiji board.
You can look up online how to conduct tests with this to ensure nobody is actually moving it. It is important to note that only demons have the strength for sustained contact with humans.
Ghosts and poltergeists do not.
I have no direct evidence of demons since I avoid situations where I might open myself up to one and I am not trained to deal with that.
So you really aren’t going to find anyone with direct evidence because if they are facing off with a fallen angel they are probably too distracted to bother recording it.