I'm not sure if this would help, but if I were in this situation, the most ideal would still be to visit the location.
But first, I would google the church's name and location. Some churches have their own websites, and if they do, they might have a photo gallery. Alternatively, google 'Wedding/Easter/Christmas at SAID Chruch' and see if that turns up anything.
If it were me, and I really cannot find any photos of the church at all, I would then call the office or speak to the bride and ask as many questions about the layout of the church, lighting conditions etc, or ask if I can be put in touch with anyone who has had their ceremony in that church recently. Explain your predicament and ask nicely if you could see some of their pictures. Basically, I would look for any info that I could use to draw some sort of hazy mental map without having to leave my home (since you mentioned that it's too far for you to just drive out there and there might not be enough time left).
Having said that, and going by the 'rules and guidelines', I suspect the priest is very particular and wants photographers totally out of the way.
I would be prepared, since this is a paying job. Having no idea of the church layout and lighting conditions, I would pack at least 2 (or even 3) bodies, 2 wide to medium (a bit more on this later), a fast 50mm and 85mm or 100mm as well as a 70-200 2.8IS besides a good tripod, as well as flash for later use after the procession/group shots etc.
One or even two camera(s) would be set-up on tripods strategically near the alter and on the other side from where I am, with a wide to medium lens and the other the fast 85 or 100mm prime, on a tripod/tripods and hooked up with a remote radio shutter release(s) that I can fire from where ever I am relegated to. The remaining body I carry, along with all the other lenses. That gives me at least two or three different vantages without upsetting the priest, and proceedings. Remote cams are great if for any reason you can't get a 2nd or 3rd photographer.
Can you get budget for rental of extra bodies and such?
But that's just me. I still have two days before the wedding. 
All the best for this demanding assignment.