There's absolutely no point in that. The alt would just be getting banned. What I am saying is. We need to have the evidence that our things were taken, and we get them back. It's really not that complicated.
Let's say my alt "scams" me for 1000 diamonds and 100 millions in survival. It would be totally worth it because I get to retrieve my stuff back from my alt, then I report him and get 1000 diamonds and 100 millions extra for free when he gets banned. An alt is only that an alt, also is only 31 days. You understand me now?
In all honesty, people who scam should get a 30-Day lobby ban not just from the gamemode but from the entire server right? This would definitely put scammers to humilation when they get banned on the spot and learn their lesson when they come back to the server in which we all know and love.
There would definitely be a way around this such as telling them to go first and what if they can just remove the items as soon as you trade? ;)