Update. Got it off by screwing the nose piece into the bezel really tight then unscrewing it and the bezel came off with it, it screws into the rotator now but the threads aren't brilliant but it's tight so I'm happy.
Anyone tried this with the StellaMira 2" Field Flattener as I believe it's identical to the ovl field flattener ! ? Any way I've ordered the rotator and will update later this week. And yes that bevelled section is really stuck on ! Gonna soak it in hot water as suggested ! Ordered a rubber wrench thing now as it's not shifting and it definitely comes off as if you look inside there's further threads behind the bezel !