Sorry FP, I posted before I realised why this thread had been bumped. You could get lots of cold things, like Spanish tapas, Italian antipasti, etc, to lay out in a buffet. Cherry tomatoes stuffed with cream cheese, or little peppers the same, mushrooms with blue cheese and garlic, could all suit your DH, alongside maybe some vol au vent cases to put some reheated turkey bits and some sauce - all of these can be cooked and served hot. While your DH may not have things like breadsticks, crackers or french bread slices (even garlic bread), is there some gluten free bread you could put out alongside these?
Hummus, sour cream and chive dip, salsa (perhaps with carrot sticks as well as breadsticks and crisps for dipping?).
Slices of cooked and cured meats (we do things like parma ham, braeseola, regular ham, couple of types of salami etc), maybe smoked salmon or plain poached salmon, prawns in sweet chilli sauce.....
Nice cheeseboard with some nice chutney or quince alongside, grapes and apple pieces, and would your DH be able to eat oatcakes rather than crackers?
M&S do lots of lovely things to serve hot and cold. I often take ideas from what they do and then make them up myself to suit our needs/tastes.