I have found with the man in our lives we have to work on them subtly but effectively

Maybe start by saying that you would really love to renew your vows and then a few days or weeks later say about how you want to mark your 5 year anniversary with something special. Then maybe do some research on a suitable location that you think he would like, take him for a picnic and say how nice it would be for a celebration..... see where I am going with this??

I would even in a year or so get to the point of costing the wedding and telling him it's ONLY going to cost x$$$$ and make the amount seem small.

Goodluck and hope you get the day you want