Yes, I think I saw something like that on Andrew Zimmer's "strange food guy" show and It looked like a big disk on re-bar like legs sitting directly over a camp fire. The were cooking hog guts or crawdads or may be they were frying cracklings but I thought to myself "Hmm, I'm purty sure I need one of them." When I was building my uds I was thinking about using the disk lid as a cooking surface, just invert it and your off to the races, kinda like a Chinese wok. I would set it up to mount the fire basket higher and let the disk sit right on it for extra heat or lowere the basket a couple inches for milder heat. could be worked out with a little experimentation.
ASC sells a 30" disk Brazilian made of 1080 steel but its a difficult fit for a lid on a 55gal UDS but would be Ideal stand alone.
never been a horse that couldn't be rode, never been a man that couldn't be throw'd.