I know when we got married in Jamaica, our photographer didn't sit down to eat at all until he was completely finished with our package time, and then he did sit down with us. We had included him with us for a meal, again it was just the two of us so it was no big deal.
An option might be to include them, but maybe if you have a table that isn't completely full perhaps have them sit there together. The other option too, if your package on time is complete, you could find a way for them to go maybe to the resort buffet, on their own, and get a meal there, or one of the onsite restaurants.
Best thing is to check with your WC because I'm certain, if the photographer isn't going to be part of your actual meal group, that they've dealt with this any number of times and she would be able to tell you how to organize it, especially since so many of the contracts have that clause. Maybe a ticket needs to be prepared for them or something that they would need to pick up from the WC once their work is done.