This is one I've been tinkering with for a while. Way back in the 70's my Dad had some neat little eggcups that had a teensy compartment for salt and an area to put the shells in. I can't remember exactly how they went, but mine go a lot like this.
Don't use CAPA. Hot eggs just disappear through CAPA. You might want to apply a layer or 3 of food-safe varnish.
Please use only free-range eggs.