Zincs on a wire rope rode will protect it ,a bit, but the tiny current wont travel more than a link or two up chain, a poor conductor between the links. That is why a stainless anchor will only eat the first few links of a galvanized chain.
There is no reason a cruiser shouldn't be building his own anchors.
I have used AR plate for shanks on Delta anchors for decades, no problem. T1, or QT 100 are other high tensile steels which work , altho I cant see half inch mild steel bending all that easily.