@FinchHaven This is the only way I can think of that might work — nudging people gently to consider posting next time with a CW instead, by showing them that if the same thing they posted had gone out with a content warning, and if people here had actually been given a choice as to whether they wanted to share that content with a warning or without one, the post with the warning would still get shared.
I am happy to abandon this, delete it immediately, and try any other way—if there is a way.