Warm metal bends/reforms more easily than cold metal. Warm your oven on its lowest temperature setting then turn off once the oven reaches temperature and sit the lens in the center of the oven for 15 to 20 minutes. Be sure to remove the lens caps and filters. Sitting the lens in direct sun for an hour or so will warm it up also.

I will not hazard a guess as how reform until I see how it is bent. I would be cautious trying some tricks as the metal can crack or break.

Accurate measurements are not easy on cameras.

The screws are most likely sealed with a thread locker that requires a special solvent to loosen that is used by Olympus and their service centers only.

I routinely fix large and medium format cameras, their accessories, and shutters. A bent mount is within my abilities and is something I would tackle on 35mm gear while a body CLA is not.