I have an Idea
The idea is that you guys add division mastery emote, something that people can choose to use.
Lets say you are Diamond and you do something great so you just "BM" with your diamond emote and not your champion mastery level emote.
I have a few options about the idea..it would either be your last season rank division emote or your current one but the best option I really think there is that you can purchase with ip/rp any division emote to your division. So lets say you're Platinum then you can purchase any emote from Bronze to Platinum but not division higher because you're not that division.
I think it would be something people would really like in the game because think about it this way..you just did a really good outplay on someone in high Diamond game and then you "BM" your opponent with a Bronze emote..it would be really awesome!