Choosing Your Fire Dish
I have seen beautiful copper fire dishes on metal legs for sale in garden centers which are not expensive and need no adaptation.
Alternatively, you can use any large fireproof metal dish either with metal legs or raised off the ground on heat-resistant bricks to avoid scorching. This can be very large cast iron wok or the bottom half of a domed iron barbecue, again the kind with legs.
A chimenea is also a good alternative and these are widely obtainable, as is the less exotic incinerator base.