It will be a great wedding gift that can help them financially and can help them understand what bitcoin is
It's a good investment and it would be a big help for the future, we didn't know what will be the value of bitcoin in the near future.
Since my girlfriend also know about bitcoin and how to do bitcoin, then I guess bitcoin would be a great present in our wedding, I would secretly send a message to her that she should open her wallet before our wedding, I bet she would be surprise and glad at the same time. In fact, it is also true that bitcoin might be more valuable than it is right now, I mean its price would be more high than we ever expected.
Bitcoin as a gift is just being practical with your partner, relationship is not all about love, sometimes you need to be practical too in your life with her, because making your own family is not that easy if you are not financially stable.