Nicely done, very simple, but elegant, with some style. As it should, the event is centered around the bride and groom.
A Micro Cinema camera with a EVF or SmallHD Focus would be a good choice for shooting a wedding, that is going to be rendered down to 720p anyway to get a DVD. This way, you keep,the rig small and simple, and can concentrate on the event, and not the camera. Get one with enough lead time to get used to how it shoots and the files edit. You can add the BMPCC/EF Speed Booster, and use your Canon EF lenses.
While the UM 4.6 is a great camera option, if you go this way, make sure to get in lots of practice with it beforehand. But, I think using the smaller camera will get shots you might not with the larger camera. I am speaking from a personal history as an event and wedding photographer. People often become intimidated by large cameras aimed at them, some of my best work shooting people and events, was working with small camera setup, allowing the subjects to remain relaxed and themselves.
Cheers