I think I will do that next time I run into the detached air cell, I set 11 eggs under a hen and one week later removed 2 eggs to a hatcher, one had a detached air cell and another that had a crack that looked like it had repaired it's self but I didn't trust it to under the chicken. I had not experienced air cell problems before, I get my eggs a couple miles from my house, but The air cell egg was worring me because I didn't know if it was still alive, (blood ring?) and the air cell looking like it would tear through the egg. I broke it open thinking it was dead, but it was not. Next time I will try that egg carton idea.
cracked egg is doing well, as well as the 10 blue eggs under broodies.