Broken Back Cover - Omega art collection 999, watch 1987

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Hi everyone,
I'm the owner of a rare Omega Art Collection quartz watch from 1987, limited edition (serial B.586/999). It's the maxi size (~40mm case) with black ceramic bezel/dial, date at 6, and the geometric abstract art medaljon on the case back (multi-colored bars and squares, likely Richard Paul Lohse or Paul Talman design).
The sapphire glass on the case back is cracked (from impact or age), but the art medaljon underneath is completely undamaged. The watch runs fine (quartz movement), but I'd like to replace the sapphire glass to protect the medaljon and restore the watch properly.
Questions:
Has anyone successfully replaced the rear sapphire crystal on an Art Collection model? Omega no longer produces parts for this series.
Recommendations for a watchmaker experienced with these (preferably in Europe, but open to shipping)?
Approximate dimensions: visible medaljon/glass area ~32-34mm diameter, flat sapphire, secured by 4 larger screws (out of 8 total on the case back).
Any photos of a disassembled Art Collection case back or teardown would be amazing!
I've attached photos of the front, case back (showing the crack), and close-ups.
Thanks in advance for any advice - this is a cool collector's piece and I'd love to get it fixed properly!

 
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Hi everyone,
I'm the owner of a rare Omega Art Collection quartz watch from 1987, limited edition (serial B.586/999). It's the maxi size (~40mm case) with black ceramic bezel/dial, date at 6, and the geometric abstract art medaljon on the case back (multi-colored bars and squares, likely Richard Paul Lohse or Paul Talman design).
The sapphire glass on the case back is cracked (from impact or age), but the art medaljon underneath is completely undamaged. The watch runs fine (quartz movement), but I'd like to replace the sapphire glass to protect the medaljon and restore the watch properly.
Questions:
Has anyone successfully replaced the rear sapphire crystal on an Art Collection model? Omega no longer produces parts for this series.
Recommendations for a watchmaker experienced with these (preferably in Europe, but open to shipping)?
Approximate dimensions: visible medaljon/glass area ~32-34mm diameter, flat sapphire, secured by 4 larger screws (out of 8 total on the case back).
Any photos of a disassembled Art Collection case back or teardown would be amazing!
I've attached photos of the front, case back (showing the crack), and close-ups.
Thanks in advance for any advice - this is a cool collector's piece and I'd love to get it fixed properly!

Your best bet is to disassemble it and take measurements of the sapphire (are you sure it is sapphire? It typically doesn't break that way...), and you can probably just get a replacement of the same dimensions.
 
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It shouldn't be hard to find a replacement crystal. That one could be mineral glass by the look of the crack. A crystal that size would cost less that $5, a sapphire (if you can find one to suit) will be a bit more.

From my supplier (in Australia).

 
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The sapphire glass on the case back is cracked (from impact or age), but the art medaljon underneath is completely undamaged. The watch runs fine (quartz movement), but I'd like to replace the sapphire glass to protect the medaljon and restore the watch properly.
Questions:
Has anyone successfully replaced the rear sapphire crystal on an Art Collection model? Omega no longer produces parts for this series.
The crystal is mineral crystal, not sapphire. The crystal is still available from what I can see - part number is 063TN5460, and the dimensions are 31 mm diameter, and just 0.3 mm thick. I've never had to find one that thin, so that might be the difficult part of just using a generic crystal.

I've not work on one of these but there's no hard plastic crystal seal listed, and that's not surprising since pressing a thin crystal into a seal would likely break it. So it's either sandwiched in between two pieces of the case back, or it's glued in place. The former would be a pretty easy fix with a new crystal.