WOW! I am upset that you seem to think there are "clicks" here. I have NEVER found that. Yes, it is true there are many here that seem to be the most popular in replying to posts, but they are the ones most experienced. Many members don't post if they feel they have nothing to offer, I am one of those, and am also busy and unable to post as much as I'd like to. Also some members are so busy, they know that others have experience and the time to post if they can be helpful, so they leave it to them...I am guilty of that as well....
I have never heard of any bird as "talented" as your that is like Houdini!! I did read your thread, but had no suggestions as my 3 birds never have attempted to play with the locks on their cages and that is why I didn't reply.
My only suggestion would be a combination lock, or perhaps put his very own "bird safe" chain and lock in his cage for him to play with. Maybe that distraction will keep him away from the one on the outside of the cage. Please keep us posted, and when you find a solution that works, let us know, so we can enhance our knowledge!