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Sorry, but I don't think that's correct. Chickens are ground dwelling birds and their feet are primarily designed for walking on flat surfaces. Their toes don't grip the way a true perching bird's can. The differences in foot and toe structure seem clear to me when I compare the feet of our chickens to the feet of our parrots or even our doves.
One reason why the OP may not like using shelving as a roost is that the nighttime droppings will all be caught on the shelf, rather than falling below the roosting chicken as is the case with a typical narrow roost. Because the shelf would be the actually roosting spot, you wouldn't want to leave them there and make the chickens roost in their own feces night after night. It would get fairly nasty fairly quickly. But if you plan on scraping and scrubbing the shelf every morning, it could work.
2x and chickens prefer the wider bases than the narrow perches.