The proper tool for this kind of work is called a pin spanner or pin wrench although, as others have said, these work best with an even number of slots. You could 3D print something to match the profile you need, or you could try your best with a pin spanner and risk slipping and marring the finish.
Safest bet may be to cover the bezel with a rubber glove first to protect it, then try and get a hold with a pin spanner.
New Universal Work Peg Clamp Hand Vise Holder Peg Clamp is made of Aluminum and securely fastens to the wooden handle.. The work head can be removed from handle. The clamp work surface is designed with holes that holds the 8 pins included in multiple...
I thought I recall a post from several years back where a member used JB Weld or a Steel Stick to make an adapter. You’d have to place some plastic wrap inside then force the Steel Stick in there and push in a 1/4” socket adapter and let it dry.
I would try with a bouncy ball, with a larger diameter than the bezel.
Simply apply the ball in the bezel, it should stick to the bezel but not touch the gall or the body.
If it’s the right size you should be able to unscrew it…