Tough break! What is the case number on the back of the watch? I'd personally prefer a genuine crystal if it were mine (a good watchmaker could order one if they are still available), as you know it will look right and allow proper sealing and hand clearance. It might be a good idea to have the watch checked after such a fall to make sure no damage has been done to the movement, dial, or hands (and it sounds like at the very least the hands need to be reset and adjusted).