Using the Jenter, I have transfered eggs (since they are glued to the bottom and the bottom of the cell is removable). The bees just remove the eggs. They feed the larvae. If you transfer them just before they hatch, MAYBE some might be fed, but I have not had any luck with them as eggs.
You really can't graft eggs as they are glued to the cell and standing up. How would you transfer them without some kind of graftless system. You can with the method that this thread started with, but it does no good, in my experience.