I understand many have said many ways. If I give my wife some idea about Bitcoin history first. I will warn about it as it is illegal in our country. I will explain him well. I will make a deal with my wife, when I sell bitcoins, I will give half to my wife.
If it's illegal in your country then you don't know what you are doing, you are behaving like someone who is very stupid, pardon me for saying this, but it's true, you claimed you lover her and you want to gift her something that's illegal? Imagine gifting her gbe Bitcoin in front of the audience on you wedding day, don't you know that not all those who come to your wedding will wish you well? Some are your enemies in disguise, they might see this as an opportunity to deal with you and your wife.
If it's illegal then stay away from Bitcoin for now, or if you can be very careful, you can still hold Bitcoin without letting anyone knows.
If I were you I won't even let my wife know anything about Bitcoin for now becauSE it's illegal in the country, there is a chance that it will leak out, you should know what I meant if you are very familiar with women, they have lose mouths most times.
Is it a risk worth taking? It's better to find another gift to give to her, it's for your own good and your future life with your wife.