Honoring loved ones at your wedding

So, in light of recent events, P and I are thinking about how to honor his uncle at our wedding, while still making it a joyous, celebratory occasion.  One thing that we are doing FOR SURE is toasting with a shot of drambuie at the reception.  It was something we did in his honor after the funeral, since it was his favorite drink.   While we were taking our shots we looked at each other and knew we would be doing the same thing for Uncle Ken at our wedding.
The one thing I am struggling with is how to honor him at the ceremony.  Do we have our officiant say something?  If so, what?
Also, I've heard of the idea of leaving a chair empty w/a flower on it, but I'm worried that would just make it more difficult on his aunt.

I'm open to ideas, throw 'em at me.