I’m not volunteering, I don’t get involved in mods of any kind unless I really have to.
The concern I’d have is how the sapphire crystal seals, I recently had to fix a Steinhart by fitting a generic glass seal that needed modifying to fit, I ended up buying 4 different ones and still had to alter the one I used.
My advice is to learn how to refinish the acrylic crystal yourself and forget the modification. Refinishing acrylic crystals isn’t hard, I’ve explained how to do it several times, a few pounds will get you the materials needed and they’ll last you a long time.