Any way to get rid of an unwanted champ?

I bought Azir when he was released because I wanted to support Riot's decision to make interesting and unique champion mechanics. I had not played him at the time. In retrospect, this was a bad idea. After buying him, I have played him a few times, and have hated it every time. He always felt (and to a certain extent still feels) buggy and wrong. I know he's powerful; lots of people can do great things with Azir. I am not one of them. I have no interest in being one of them. I'm a very casual player, sticking to ARAM games 90% of the time because the crappy player attitudes on Summoner's Rift (especially in ranked games, which I've just decided to opt out of entirely) is so un-fun. And therein lies my problem. The most fun game mode for me, ARAM, occasionally results in me getting one of the champs I own that I don't like. Often I can reroll or trade them, but I was wondering if there was any way to just get rid of an owned champion entirely. I don't want a refund; I have more than enough IP to get whatever champ I want. I just don't want to get Azir. Ever. Riot, is there some way for me to just give you back a champ that I bought?