Hello, it's not the same but it has reminded me of something called in spain Churrasquera.
I can't find info in english, only this
https://www.gastronomiaycia.com/que-es-una-churrasquera-y-como-se-utiliza-en-la-cocina-domestica/
In short, it's a stove barbecue, we use it to cook on open flame indoors. It's placed straight on top of the flame, no heat diffuser.
Maybe you could source a round inox grid from these for your oven, they always have the hole in the center.
Or if you ever come across a churrasquera, it's a great cooking tool to have.