You're registering for stemware, so why not register for something to fill those glasses!
One of my go-to wine stores here in New York City, Sherry-Lehmann Wine and Spirits, is a fine example of how to go about registering for, well, booze.
The store has paired with Bottlenotes to offer a registry program. Some fun ideas to add to your wish list? "The Anniversary Cellar" which provides you with wines to drink for your first 15 anniversaries. Or perhaps a bottle of bubbly to enjoy when you return from your honeymoon. Are you trying to learn more about wines in general? Aside from perusing the site for suggestions on vinos and bubblies to serve and information on regions, flavors, and varietals, why not consider registering for various samplers of wines and plan weekly tasting sessions with your fiance!