How to invite after initial invites?

So basically my Fiance's family have all been declining their wedding invites because they "don't want to travel to the middle of nowhere." This wouldn't be an issue if it was a dozen people, but we're talking 50+ people that we assumed would be coming until they decided to not come a week before our rsvp date. We have a 200 person minimum-we have to pay for 200 plates regardless of how many show up. So we were shooting for 225, but the random declines on top of the legitimate declines really wrecked the math. Now we're at about 170 and have 30 spots to add.


How can I invite people I didn't invite on the first go around? We would have invited them, but we had no idea so many people would decline just because of the location (it's not a financial issue, they just literally aren't coming because the Midwest is "flyover country.") Can I say that to our new guests, or would that make it worse?
I'm really irritated that my hometown isn't an exotic enough locale to make it worth their while to come to their own nephew's/cousin's/brother's wedding (it's also a tourist town, which makes their "there's nothing to do" complaint even more ignorant and stupid). At this point I would rather just invite our friends than try to convince his family to come. But I don't want to make it weird for the friends who weren't invited the first go round.