I guess at this point, unless you are willing to make a wall hanger out of it or willing to let it go as that, you really don't have many options.
I had a Kodiak Hunter with a bad twist, I did straighten it but the twist kept coming back. Never quite as bad as it had been but still a twist.
I like a hair dryer for heat and a cold towel to set it. Just remember wood and glass don't heat up real fast and you need to go slow and easy, heating a large portion of the limb.. Uncomfortable doing that? Send it to one of the pros.