Ok I respect that. You seem to have made peace with the arrangement you are in.
However, are you familiar with the theory behind the idea of mutually assured destruction? The Cold War was centered around this concept. M.A.D. is when both the parties in a conflict or disagreement have the capability to completely destroy the other, or in your case cause significant harm in each others' lives. You had a very powerful bargaining chip back when this all started (or at least I believe so reading some of your posts). I believe that you mentioned that one of the reasons behind your father forcing you into a chastity belt was that your mother left him for another man. Aside from you and his own mother, he has no-one. He was a distraught, distrusting mess who was so desperate to retain you in his life that he resorted to this extremely abusive and upsetting behaviour.
But here's the thing: he has just as much to lose from you reporting him as you do.
Personally if I had been in your position back when he forced you into a belt (I don't know the exact circumstances however, I admit this) I'd have explained the situation very clearly - that he has precisely 2 options: either he forgets the silly idea with the belt right now and never brings it up again, in which case we both agree to forget all about it or the "nuclear option" - I go to the police and get taken away immediately by child protective services. Threatening to lock up a child in bondage like that is textbook child abuse, he'd be in trouble with the law. Now neither of you don't want this , but I'd have explained that if he tries to push the belt idea even once more then he will lose you, and you don't want to lose him either.
If what I remember reading is true then he would have cared far too much about retaining you to gamble like that. If wanting to keep you desperately to himself was the reason for him putting you in a belt, then you threatening to get taken away would strike him where it hurts.
Of course there are benefits to staying in your family, but from what I've read he's got far too much to lose to let you go to report him, meaning you wouldn't have to. This is the concept of mutually assured destruction - neither party wants this outcome to occur but both know that it will if one of the parties fails to conform to the other's wishes.
You still have this powerful bargaining chip - with all your bondage gear padlocked on you at all times you'd just have to show a teacher and explain that you're kept like this 24/7 and child protective services would swoop and unleash a shitstorm the likes of which you father has never even conceived of before.
Sorry to ramble like this but I just thought that it would be fair to try an describe your situation from my perspective. I am curious whether there's something I said that you disagree with. Good night 😊.