The mastery rank six

So i Have been farming hard to get my main Zed to rank 6. However as soon as i got 2 tokens I learned that you have to have 500 Essene. But I never get blue essence so this was a huge let down to me. So I think that riot should make it so we can spend ip to make orange essence into blue essence. That would be a cool system to me. Thank you riot and please listen.