Skins for getting a champion to 1 Million Mastery Points

Well I thought the idea would be pretty cool. I for my part main ashe (currently about 400 k) and I think it would be great to have a special skin or chroma or whatever for the champion to see: yup there is a true xxxx main. Something that really relates to the champion itself and not only yeah level 7 mastery. Something not buyable and not craftable. Something that really shows your true investment of time into the champion.

And to go even further beyond (AHHHHHHHH)(super sayan refference) What about having those old ultra rare skins aka UFO Corki, King Rammus, Urf Warwick, Black Alistar and other as the reward? Of course not the original ones, but a dunno 2k17 UFO Corki for people that really LOVE Corki and want that skin badly. This way they would have at least the chance to obtain it. It wouldn't matter for me If it even was 100 Million Mastery Points as long as I could someday get it by simply playing the champ I love.

And for other champions I'd say make some completely new skins that are special and you can't get it by any other way than mastery points. ...(Dark Frost Ashe).... ....(do it Riot).....

Here you go, you have my thoughts now vote and tell me what you think should be included, excluded, would be better and so on^^.