While in Paris we'll be doing a day trip to Reims, and the logistics of the trip pretty much rule out eating at standard meal times (train home at 7:15; Champagne house tour at 1:30 pm). So if we're going to get a meal in Reims, we're pretty much dependent on places that are open all day.
In theory we could just eat dinner when we get back to Paris. In practice, I think we'll be too exhausted by then (having been on the go since early morning) to really enjoy a dinner out.
The fallback position is probably Brasserie Flo; I wouldn't expect much from the food, but the interior seems to be pretty. But if there are better alternatives, that would be welcome information (and this is a case where "good enough" is, well, good enough). The places I've found searching past threads are pretty much all mealtime-hours, except for Hall Place, which appears to be closed.
I will of course write about any place we end up going to.