im just the person who climbs, quickly at that too, i dont let average zed players run all over me, instead i do my standard build or whatever is deemed appropriate for the match.
i absolutely do not pansy out and rush seekers/roa/zhonyas
instead i finish morello/abyssal and roam bot lane before he does and get bigger and faster than he does.
there is no reason to even bother trying to fight him knowing his early armor pen means hes GOING to do more damage to me than i will to him. so its best NOT TO FIGHT ZED, and go somewhere else instead.
i beat zed > 50% of the time, and its not doing any of the things you suggest, i have literally 0 reason to try the things you say to do when i already have a working system.
the pros do not kill zed. they do not die to him, and they make sure he stays small and totally farm dependent on items. at that stage 5v5's roll around and you win more often than zed does because you didn't give him an atrocious early game lead like he normally cheeses out. so by default you win.
^ thats poor champion design.