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I'm confused. The 60th comes with a plastic crystal already, I believe.
Today a review of the watch by Ariel Adams (ablogtowatch) came out. Ariel also initially thought that it may be too small at 38.6mm but in flesh agreed it is a good size. Quiet frankly, with the trend of very large watches rapidly evaporating, this size watch is perfect and will look great and most wrists for generations. My wrist is 7.25 inches and this is the biggest watch I own, and it feels proper as a well proportioned sports watch.
I do agree with you but bear in mind when the Speedmaster was chosen the two choices for crystal material were mineral glass and acrylic. Of those 2 NASA chose acrylic. Had sapphire been around then who is to say that they wouldn't have chosen that, it does have some advantages after all and at least one acrylic crystal got smashed during 60s space missions. Note the later X-33 got certification for Space use with sapphire. Also had an auto chrono movement been available that may also have been chosen but it there wasn't one available until 5 years later so don't assume NASA chose the spec as it was the optimum, in some cases the spec was all there was.