Ekko change/idea

I believe one of the problems on his ekko can be his mixed idea, especially on his e an empowered auto that also uses sheen items and attack damage and also a blink, my idea is making his e not do make damage and turn his next auto into only magic damage, converting maybe a %of his ad or sheen affects, all my idea is to make it so it doesn't do mixed damage.

it will encourage ap ekko to be build more and his passive and e that can be used as a passive proc wont do much dmg when built tank if the damage is no longer mixed.