Think I did the same as above - if I can't unscrew a bezel by hand, I then use the somewhat sticky blue gloves I bought at Lowes. Those gloves I've used many times for loosening tight bezels, etc.
For a driver problem, it's beyond me to trouble-shoot those kind of drivers. some here on BLF know a lot more than me on electronics and are comfortable doing that. For me, I'd simply replace the driver with a FET+1 style, running Narsil - actually I just built a driver up for the MT07, using HQ latest v3.4 here: https://budgetlightforum.com/t/-/40540.