I'm not sure about those specific items, but I definitely feel like niche items like Zephyr were and are good for the game. To be honest your idea for Zephyr would probably work even if the others may have some problems, if only because it would have a unique niche that isn't basically bad Triforce.
I think your other two items run into too many conflicts of use. Your first item's always going to struggle to differentiate itself from Statik Shiv, it will probably just turn out that in crit heavy metas Shiv outshines it and vies versa. Your second item is just Black Cleaver without the shred in terms of use case, I really struggle to see anyone wanting it over BC assuming they were similarly priced.
If I was going to do an item in the vain of Ionic Spark I'd probably look at something like
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50% AS, 350HP, 25 magic damage on hit (2800 gold)
Passive: Moving will make your attacks energised, additionally melee attacks provide 25 stacks
Unique Passive - Chain Lightning: When fully stacked your next attack will chain lightning on up to 4 targets for 30+10xlevel magic damage, +50% for melees.
Clearly differentiated from Shiv in terms of use, far better on champs like Irelia and Jax rather than Kog and Vayne.