"Do you think they'd make an exception for someone with a 15 lb. nursing baby?"
Yes! But you might want to make sure they have pews. Even if they don't, there are always chairlike "stalls" along the sides where you can sit after a fashion. :)
I'll put a folding chair in the back of the van, just in case! I've known mothers who could nurse standing up, but I've never been one of them.
Got approval from Der Prinz for our excursion to the Greeks - should be fun! He thought we might all go, but I don't think they're ready for a full-scale invasion of Redneck Evangelical Catholics :-).