How far in advance of serving can you fry fried eggs?
Surprisingly, an egg is the most difficult thing to cook. McDonalds serves a lot of eggs in their breakfast menus and they haven't found a way yet to mass prefry / prcook these suckers. So I doubt this could be done.

I tried half cooking scrambled eggs before and then finishing them off later, and the result was crap at best.

I doubt you can do that with non-scrambled eggs, as the yolks and whites will change physical properties when heated / cooled / reheated