The only way to get the ring out for me without damage or strain other components ,board or case was to take a 7.5mm drill and drill out the ring from the back and when the inner bracket came lose you know you are deep enough .
A little dot of CA applied with a toothpick to glue the lens inplace and a little glue on the inside to fix that bracket.
Tip: if just the lens glass piece is broken and there is no damage to the ring try to source and buy the glass lens without the ring alot easier to
repair ,you don’t have to take the screen and camera if no glass made it to the camera.
Just make sure that the ring and the rim where the glass is seated is clean and free of glass splinters and glue .
Again add a little CA with a toothpick pop in the lens and done.
Few minutes of work and no risk of breaking somthing in the proces.