Loot and crafting inventory

So i and a friend of mine have this problem we play league i gain keys and he gains chest and we can t trade. what if we could trade loot itms exept those mastery things. So for exemple i m normally a support and i gain a skin that looks pretty cool but i hate to play nidaly so instead of me waiting three months for two more skins i could trade a skin for frinds skin . And just a minor detail because of thief and stuff like that before the trade a warning would appear on your email from riot asking if you really want to trade.

This will probably will never happen in league but if it happen it would be pretty interesting.