Although i know it might sounds odd or uncommon to us but I think this will help them a lot and the awareness of Bitcoin because they will end up telling their friends and the friends telling more friends.
Yes, it does however, I am hoping they actually will be interested and both are able to HODLing because most ladies as we know like to spend cash and they don't cash out quicker than expected

and if that is not the case, then they might be able to also educate some more friends as you think but I too believe in other more suitable gifts for that occasion and Bitcoin in a more focused time.