A reward for obtaining all skins in a skin line

Hello, so I was thinking about some sort of reward (an icon) for those who finish a skin set (K\DA for an example) by obtaining all skins (7 in this situation) by doing so and having all of them available in your collection, you'd be eligible to equipping said icon and showing off to everyone that you have finished collecting all the skins for said line. to answer some questions that might come up, a new skin for the skin line? well Riot already made an answer to that lining skin lines to 1 and 2 like they did with Star Guardian skins, for long skin lines such as Project, you can add tiers to the icons for when a new skin is added to the line. Also it would be nice for when getting all skins for a champion, some champions would be harder than others (for example Janna and her victorious skin) because the skins are no longer purchasable, but it would still be nice to do that (it would also work as an incentive to complete skin sets).