Way to change zed to nerf him without gutting him
All they have to do to zed is make his passive no longer affect winions, move his slow to his passive and remove it from E.
First off reason for winions which is a simpler explanation. Since zed can execute winions shoving doesn't affect him and he doesn't have to make a choice between using abilities on winions or on you most of the time. This nerf would just hurt his early laning phase slightly not immensely.
Now the slow change, it's fine for assassins to have light CC I'm not heavily against zed having it only reason why I want them to try changing zed's slow is:
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It doesn't affect his combo, it's like when they removed LB's silence she still had her damage and able to do LB things but people could just retaliate better. Zed's combo if instant would land or miss regardless of the slow and if zed holds his shuriken the slow will still probably expire and he can still land it.
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Zed's slow adds onto his already great escape potential, because of his slow not only can zed escape easier but he can also save teammates occasionally or counterattack.
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Zed's slow helps him gap close for AAs. Reason being after your combo you slow them and you have too much of an easy time AA'ing them to death which might be exaggerated but zed's damage isn't just combo but landing multiple AAs additionally.
Although players may want damage nerfs what I'm suggest will in turn nerf his damage as long as you stay calm and avoid his follow up, he will still have parts of a slow's benefits but lose the safety/escape portion and not a garunteed gap close aid unless the unit is under HP.
This is a balance by changing where his power lies in slightly less situations which can be minor or major depending on how skilled a zed player is.
TL;DR- Real way to fix zed is moving his slow to his passive and removing his passive from working on winions. Keeps both the side of who plays and who faces zed happy.