This is what I do. Seemed easier and cheaper to get a stone for the existing BBQ than a pizza oven.
Tips. A decent amount of charcoal for a long, hot burn if everyone is going for 2 pizzas + a cooked pudding. Strong flour and dough made and proved well in advance. We use passatta for the sauce and pre-grated mozzarella for ease. Topping – cured ham, peppers, mushrooms, basil, red onion, more onion, sweetcorn for kids, think that’s it.. anything really.
If you have a smaller travel BBQ get a stone for that too as camping pizzas taste even better than home ones.