I’ve not heard of anyone else making such a thing, but not surprised it does exist. However, I can 1-up that with my childhood creation - the triple fold sandwich. One slice of buttered bread, one slice of buttered toast & one slice of butter fried bread. Fold each one in half, overlapping half of the adjacent piece. You get a mix of three different bready textures & flavours in each bite. I haven’t made it in a few decades so I may not enjoy it so much now, but it was good at the time!
I’ve not heard of anyone else making such a thing, but not surprised it does exist. However, I can 1-up that with my childhood creation - the triple fold sandwich. One slice of buttered bread, one slice of buttered toast & one slice of butter fried bread. Fold each one in half, overlapping half of the adjacent piece. You get a mix of three different bready textures & flavours in each bite. I haven’t made it in a few decades so I may not enjoy it so much now, but it was good at the time!