We will see what we can do. Considering these are already made maps, I wouldn't think it to be possible unless we modify the one small option, and then call it "trade_plaza_tf2ss".
It might not be an easy process. But we will see what we can do. Although I do recall even public matches don't allow stickies, nor pipes into the spawn. So if that's even the case, the problem you seek to be solved, might have to be taken to valve. But I could be wrong.
Either way, we will take our time to look into it. Thank you for the suggestion.