Does anybody know of any shallow wall ovens?

Pizza oven! Can work for any foods.

Plus boy scouts of america and the rangers have a machine that makes pizza, cassaroles and cakes and that and works on hot air. They use it in the forest or at home. I wish everyone had that. I saw it reviewed in their magazine.

Microwave.

Make a rotisserie, metal bar, coals, ask your local butcher/grocery butcher how he got his. It stands alone.