Could we please have a control ward trinket upgrade?

With the removal of pink wards and the addition of control wards the problem of not being able to buy these late game (With the exception of having to sell and re-buy items) is a very real issue.

However you do it, please give just give us a reasonable way to get control wards later in the game, it doesn't even have to be a level 9 upgrade, it could be unlocked later in the game or have its own slot,

We just really need this considering how much objective importance skyrockets in the late game.