Since you used up most of the common disciplinary ideas.
Try calling Totem Town see if you can do a tour or they have group sessions there, I don't know if outsiders can sit in on the sessions. Or maybe call juvenile court or something see what they suggest. Ask your school principal too of ideas.
My son seemed at one point too much for me to handle....I thought I had lost him to the point of no return. But miraculously he came around and he's a very nice man.....everyone looves him. So there is hope too.
Good luck......there's a light at the end of the tunnel
somethimes it just takes them to just grow up.