X-grading PSA 10 to BGS - anyone have experience with this?

From my own collection and those sold on eBay/PWCC, I know that not all PSA 10s are the same. Some appear clearly off-center, and still get a 10. Some have slight border issues and still manage to get a 10 somehow. So let’s exclude these “misfits”, and focus on those that truly appear exceptional -great centering, no whitening anywhere, perfect edges etc.

Questions:
(1) Does anybody have experience x-grading these PSA 10 gems with BGS?(2) If yes, did you ever get a BGS Black Label perfect 10? How often?(3) If not, did BGS crack the PSA 10 case anyway in order to figure out the x-grade? Or can they determine the BGS grade without cracking the case?

Just curious. I suspect some here have tried it. Perspectives appreciated.
PS: I did search but did not find any info on this specific question of x-grading PSA 10s to BGS Black Label.

www.elitefourum.com/t/the-giant-professional-grading-thread/30930/1