It is always worth rememembering the original cause of this happening, over tightening.
I will bet it was the man with the 'windy-gun' with torque settings far too high.
It will happen again , so the only solution is to remove the security bolts before it goes into a 'garage'.
Fit the standard ones in place of them , a pain but a lot less expensive in the long run.
Yes, it has happened to me.
Once you get that ring off you should be able to find 'someone', or even buy, the special socket ( e-bay) that reverse grips the stud to undo it , slow , irresistable force applied should do it.
Just hope you don't get a puncture in the meantime !