A vision change for season 5(improved sight stone)

So since the season 4 changes maintaining vision around the map requires the effort of multiple team members, but convincing a team member to buy wards instead of a 6th item tends to be quite difficult, since the enemy team will most likely not be skipping full build to buy wards. I noticed when playing smite that they had 2 separate item slots specifically for consumables, like wards and potions. While this would be pretty cool for league I think there is a better option, making sight stone an enchantment.

Here's how I could see it working, sight stone no longer builds out of ruby crystal, instead for 400 gold it is available as an enchantment that can be applied to any item that does not already have an active, giving it the ability to place wards, and upgrading for 250 gold to be able to place 3 wards at once with a cash of 5, similar to ruby sight stone now, upgrading the item, for example bf sword into IE, would see the buff carry over, but upgrading to an active item like NLR into DFG instead of deathcap would lose the active but refund partial gold for the upgrade. Unless you are playing the weirdest build ever, you are going to have at least 1 non active item in your inventory, this should still allow for boots to have the regular enchantments in addition to the sight stone effect.

This way, there would be no excuse to not be placing wards, since they would not take an extra slot.