Don't know about WP, but do know that both Josten's and Balfour's does offer the class crest shields as a purchase option when class rings are ordered. The cost depends on the K of gold ordered.
Hey Buff - Would be interested to know whatever you can find out from the Cadet Store. I recall purchasing a gold class crest when I graduated USNA (long ago) and giving it to my mom for mother's day...made a big hit. Thanks!