Spell Vamp Item

I was waiting for a friend to finish their game a few days ago and decided to make item sets of a full stat. (like AP for example) I checked Spell Vamp and realised that there are only 4 items. Guinsoo's Rageblade, (which no-one buys in a normal build) Hextech Revolver, Hextech Gunblade and Will of the Ancients. Considering that the last two build from Hextech Revolver, I feel there really should be more spell vamp. Furthermore, the introduction of "AP statikk shiv" makes this idea seem even more viable to me.

This is my idea: AP Vampiric Sceptre. Stats: Cost: 600-1000 Builds From: Amplifying Tome +20/25 AP +~8% Spell Vamp

Following on from this, a sort of AP Zeke's Herald. The stats would be: Cost: 2400-2800 Builds From: AP Vamp Scepter + [Kindlegem?] +~300 Health +10% CDR Unique Passive: Nearby Champions gain +10% Spell Vamp and +10-25 AP

I don't know how balanced/sensible these items actually are but I hope you'll agree that more spell vamp is needed in the game, particularly when very few champion build the items.