Just needs a fuse.
I have dropped on concrete from 6” with no damage. I have also set glass down on concrete ever so gently just to have it explode. Sorry about your bad luck.
Honestly your best bet is to hit up one of the guys on Pinside that makes custom back glasses - perhaps they can whip up something cool until you find a replacement. Good luck.
Oh that is going to be a tough glass to replace but they are out there; actually had two years ago but they are long gone.
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