Mine had cracked also. Tried to glue it, but nothing held. I found a blue rubber to cover it from classic industries. Couldn't find an original, but if you find one let me know.
That is correct the medallion does cover the lock. I took the lock out without grinding, or cutting. Can't remember how I got it out, and or how to put it back in.
Wish, hindsight got on this site sooner. The bad thing is the next body shop had it a year with little to nothing done. That was in 2019. 3rd shop was a charm. Have had the car back since 2023 should be done by end on August. (Cross your fingers)