Here’s my method for unscrewing the glued bezel ring.
I did get the head to unscrew using two pieces of 3/4 inch (19mm) thick soft pine with 1 and 1/16 inch (27mm) holes through the center with a thin saw cut through part of the middle from one end to allow compression in a vice and clamps. Compressing the wood separately for each piece allowed enough grip and leverage to loosen the bezel ring with no damage or personal injury. I did this while one or two remaining emitters would still go into turbo resulting in a hot bezel that probably softened the adhesive some.
Pictures:
A 1 and 1/16” drill bit is not common, but I have one and it worked great. Hope this is helpful to some.