What if S+ grades granted Hextech chests?

Now for all the one tricks like myself that don't particularly fancy having to play and perform well on a variety of different champions to gain loot, could it be a good idea to set Hextech loot to good grades on the champions we do like to play?

One S+ grade per week for one chest. Limited to only one champion that you've already earned a chest on per week. So If I get an S+ on Quinn in week 1, I can't receive a chest on Ashe from an S+ in that same week 1, but can in week 2.

I feel like it's a good way to allow players to receive loot without having to mess up people's games going 0/7 on other champs they dislike for the sake of more loot.