I know it's the opposite of what you want, but how about incorporating bitcoin into the wedding favors. I know match books are out of style but something similar with a paper wallet printed on it would be nice.
This is a nice idea. Maybe give each guest a fraction of a BTC? It will expose all of the guests to the Bitcoin world. I am not sure how you could do it? Perhaps have them email you after they open up their own wallet and you could deposit a small amount as a "thank you" for coming. Who knows, a gift of .1 could be worth $1,000. someday.
Of course, there will be guests who will not care or want any coin but it is a unique idea for sure.
If the price of BTC goes up, I think your fiance will suddenly become very interested. That is what happened to me anyways. We bought in March and in April and I was blown away at how fast the price was going up. Of course, it went down too. But I think it lit a fire under me. I researched it myself and realized that there was so much potential. Granted, a risky investment, but with risk comes great rewards. The early adopters are earning their fortunes by stomaching all these ups and downs for sure.
Blessings to you both on your new journey together!!!