It is 'glass'? uhh.. with over 1.5k posts, I'd expect something a bit more specific :lol:
Is it mineral? If you're wondering if anyone has replaced a crystal.. then yes, people do it all the time.. the most difficult part is sourcing a sapphire that will fit.. and will look as if it belongs there.
Before you start ripping apart your new watch.. I'd make sure that it is mineral glass, and not sapphire, already.. once you have confirmed that it is mineral, and is worth swapping out.. then take a measurement of the size of the crystal, and go online to find a sapphire replacement.. Ofrei has a wide selection of crytstals in various sizes and shapes.. my guess would be that this crystal is a very regular flat sapphire, which would be easy to source.