Converting Chests Into Frags

So, as you all know, Hextech Crafting is here! (Has been here for a bit actually, so. . anyways,) We all (should) have a trash ton of chests, but no key frags! Today I just got 2 S's on Thresh (gave my adc 2 2v4 quadras)but can't get any keys. So my solution is, when you get a S and can't/don't want a chest, you can convert into a key fragment! Feedback is aprpeciated!