Idea: Champion Mastery rewards summoner icons

One of the main hindrances to creating higher Champ Mastery ranks, at least according to the red posts I've read, is finding rewards that are fulfilling to the player for the effort involved, while staying within reason, so skins aren't being handed out left-and-right causing Riot's profits to go down the tubes lol

With that in mind, something I've personally been holding my breath for in the hope of becoming true (only occasionally to the point of passing out) is a reward system where Mastery ranks with a champion reward their ability icons as summoner icons that I can then display alongside my banner. If I were to rank Lissandra to these higher ranks, for example, it might start with giving me an icon of Ice Shard at Mastery 6, then proceed into Ring of Frost at 7, Glacial Path at 8, and ending with her ultimate Frozen Tomb at Mastery 9. Finally, to round it out, upon reaching Mastery 10 I am rewarded a summoner icon of Lissandra herself, showcasing all of the time I've put into the character.

Edit: I forgot a spot for a reward-icon relating to their passives! derp. Maybe it's an additional reward for hitting ten?

The assets are already there so it shouldn't be overly difficult, I presume, while providing a cool window into the player as they tout their favorite champions' and/or abilities in the loading screen. This would act as a tangible gain for the effort we've demonstrated in leveling up the champions, something Riot has seemingly been on the lookout for.

I've been using Glacial Path as my avatar outside of the game for over a year now, ever since I truly began to "main" Lissandra. I'm sure other players have displayed a similar devotion to their favorites, and I think this would be an amazing way for us to express that within the game <3

Comments are always welcome; let me know what you think of this idea, and which ability/character icon you'd want the most! :)

Edit: Not sure if this is the correct place on the boards for this proposal; if it's not I'll gladly move it haha :P