Try wrapping the bezel tightly with duct tape, many layers. Same with the rest of the head. Leave a space between the two so the bezel can rotate. Two pairs of channel locks will get the bezel off and as long as your duct tape is thick enough you won’t maul up the anodizing. Yes it does have glue on it but it will come off. I just slowly applied more and more force until it finally broke free. Worst case scenario is you are spending 30 minutes getting the sticky stuff off the light.
Once you get it off the emitter swap is fairly easy. You’re going to have to reflow whatever emitter you want. Few resistors on the MCPCB and a button on the bottom of it to make contact with the battery. So just make sure you secure that button so that it won’t fall off while you are heating the MCPCB. Other than that it’s not so bad.