I don't see why using a Dutch oven wouldn't work. My only thought,,,, When placing pie tin into Dutch oven,,, avoid direct contact with bottom of pot. Direct contact may burn the crust more than desired. Placing stones on bottom may create a buffer to stop direct contact.You just gave me an idea for an experiment.
I wonder if it’s possible to put a pie tin inside a cast iron Dutch oven and bake a nice looking pie with just coals for heat. I suppose it’s worth a shot. I just need to do research first.
Still, that’s an awesome looking pie. I’m might as well try making a rhubarb pie myself.