What you need is a large pan and lid with something to put inside to get the baking pan up and off the pan bottom. The problem is that the baking pan must be an inch or more off that hot surface to keep from frying and it's easy to run out of room working inside a pan. I baked a small pizza inside the pan using the metal spacer from an old pressure cooker, (about 1/2 inch off the bottom) but it did burn the crust a bit.
I have been using a small Cobb Grill and it bakes very well. You can even bake cinnamon rolls, dinner rolls, etc., at the same time as you are cooking other things. You can bake a pretty large pizza on a Cobb but it's best to brown the crust, then turn it over to put on any moist toppings, and then bake. The Cobb Grill makes a great winter cockpit heater, too.
The Cobb has an inside pan kind of like an angel food cake pan that you can put cut up corn cobs or other veggies, potatoes, onions, etc., in and then put the grill on top for steaks, roasts, etc..
John