I would stick to the gifts on the wedding registry. Alot of people don't appreciate gifts that don't conform to the specific tradition of the country.
Gift registry is a big help to all of the friends and guests of the groom and bride. In here, the couple will choose what they want to receive in their wedding and the guests will just choose in the list and they'll buy. So if bitcoin is in the list, I'm grateful to give it to them, maybe some satoshis will do. But if there's none I just choose in the list and buy it for them.