I am saving my eggshells and crushing them when they dry out but haven't fed them to the chickens yet. I wonder why that article you quoted from didn't include feeding them back their shells. I had been putting my eggshells in the compost pile but the chickens found that and were eating the eggshells so I stopped adding them there and clean them all up. They looked too close to the real thing. My SIL said to put them in the hole when you plant your tomato transplants. Too late for that now but I might stuff them alongside anyway.you can buy one of those metal diffuser plates, I had one in my old stove when we lived down on Long Island. You can also put them on a cookie sheet for a bit maybe, or even just a sauce pan or skillet. You are right though.. trade off..lol
I guess I need to look for those old metal diffuser plates. I remember those years ago when I was a kid.