I don’t think you will have issues in getting your dining time accommodated. I have traveled most of the major cruise lines and Cunard have been the most accommodating. Any example we saw on the QE a few months back was a little girl with multiple issues involving food . The head chef and maitre d made I a pointless present her specially prepared meals even in the buffet in such a way it made her and all around her special. This took effort do I’m sure your request will be handled well.