AchiCAp0547 - glad to hear that everything turned out to be wonderful for your wedding day! I would definitely have been doing some major venting myself if I were you in that situation.
Did you already send invitations for the traditional wedding to these people before changing plans? In that case I think a letter explaining your plans and wishes would be best. Are you planning on having an AHR? If so you can explain how you're going to throw a party to celebrate with them once you return.