Look, if your wife is Gold it is hardly worth the efforts to try to get your HH D No. in the reservation in advance, you will not gain much by this. Let your wife make the booking in her name (it is easier and can be done online) and show your HH D card at check-in. Alternatively, your wife should call and book the room in your name and let the agent have your HH D No added to the booking as add. information as suggested above.