I'm thinking of exposing a metoo case when I'm not the victim
Why would you do that?
I'd like to see the person brought down.
It may be a better idea to not get involved with this one. This is such a sensitive topic, and you should really just allow the victim to come out if they choose to.
I'll do it secretly so it won't hurt the other person.
If you're not lying about anything and have actual evidence, then I guess go for it.