This is the "unofficial" Disney weddings site...on the particular page I posted, it lists two of the officiants Disney uses and their websites...they are most likely affiliated with other locations in the Orlando area where you could do a vow renewal. I know Rev. Tim is, I would guess Rev. Jack Day is as well.
I know he and his wife do other ceremony locations as well...contact them and see what you can do.
As I mentioned before, you can contact the Swan and/or Dolphin and do something there...
Also, you might try doing a google search on "Orlando Weddings" and see what you get.
My experience is that there really is no difference between an "Intimate wedding" and a vow renewal except the license issue (you have to provide a copy of your license for a vow renewal).