First off, CONGRATULATIONS!!!!!
If you wanted to, you could hire a CART provider to caption the entire wedding onto a screen. If your church has the space for it. Some modern churches have screens that they use for hymn lyrics and the like, the CART provider could use that to caption the entire wedding. That way the interpreter could concentrate on you two, the couple getting married.
if you can not find a CART provider in the area, you could call around to some Court Reporting firms and ask if they have a real time writer that may be willing to do the ceremony and reception for a fee. You should be able to negotiate the price as it will be an easier (relatively) job than a deposition or court hearing. You would be able to set it up with the reporter in advance all of the wedding guests names so that you would know who is talking.
Good Luck in your marriage and have fun on the honey moon!!!