Pure AD Caster Spell Vamp

I find it interesting that while Riot has said they want to make AD caster items more prevalent they have neglected to add an item into the game which allows pure AD casters to get spell vamp without lots of wasted statistics.

This isn't to say that AD casters aren't doing well, they certainly are.  However, in the interest of making sure that the game holds varied and interesting options in how to build, making items with AD and spell vamp without AP would be a big step towards this goal.

At the moment, all spell vamp itemization in LoL comes from the hextech revolver which has AP.  There is no item which you can buy to get spell vamp on it's own or with AD.  The only sustain that comes from AD items is lifesteal.

Now, while lifesteal can be useful for AD casters, especially those who do use a good amount of AAs, I believe that AD casters should have the option to get spell vamp without having to get a revolver at some point.  In other words, there should be a more pure form of spell vamp, or at the very least an option to get it  with AD instead of AP.

If this required some sort of nerf to kits or other AD caster items, I believe this would be a necessary step in order to make the game more dynamic, more changeable and altogether more situationally dependent.  In other words, it would help to shake up the common build paths and open up more options to fit different situations.