I have not been following this thread, so hopefully this is not old news:
David H. Fell and Co. do photoetched sterling sheet using your image -they
also sell a wide variety of already photoetched patterned silver sheet.
They have a catalog and are very open to working with individual
designers. They are at 6009 Bandini Blvd., City of Commerce, CA 90040.
Their phone is 213-722-9992 or 800-822-1996. Fax 213-722-6567