If youre going to try acetone, you will need to soak your piece in it. Check it frequently (like every 3 to 5 minutes), then see what happens. When I have done this technique trying to get acetone out of plastic cups, the cured resin gets rubbery, then I flex the cup to try to get a resin edge to pop up. I then try to pull the resin out with a pair of pliers. Obviously the metal bezel isnt going to flex, so you might want to be prepared to scrape it out. I doubt the resin is going to dissolve.