Jenn, the Breizh cafe location in Montmartre (https://en.breizhcafe.com/abbesses) might be a great idea. You can pick and choose from many savory crepe fillings, so everyone's happy. It's open every day I think.
There's also an Italian restaurant on rue des Abbesses called La Foccacia -- and yes, it's Italian. My then-11 and 15 year old nieces ate with their mom and me several times for dinner during our week there two years ago (our hotel was nearby). There were plenty of French people there, and we all love Italian food. I figured that the kids did enough experimenting and sightseeing during the day that we should make it easy in the evenings (and take the stress off mom). Also, the manager's grouchy chihuahua is often wandering around the terrasse. :)