Hextech Chest Idea

I was thinking about stuff while opening one of the new Hextech chests that were added recently, What if you could use the essence you got from the shards to purchase RP. Of course it would have to be a high price of essence like maybe 10,000 essence for 500Rp or something around those lines, But by added that you would give players that earn the shards of keys and chests through getting S ratings something to look forward to or even a reward for doing so well. The amount of essence and RP could be whatever what I said was just a quick thought but the idea made me really think.