This is quite deep, and we must think about it from the perspective of the couple and maybe as the couple.
Firstly, if you would even want to nurse this thought; you must be one of the couple's closest friends and most likely on their bridal/groom's train if they are having one. Or maybe a very close relative. If you do not have a close relationship with the couple and you are not sure how they will react, don't do it.
However, if you are close to them; I think you should run it by either party before the day; so, you know if they wouldn't mind.