Is there a way to remove mastery from your collection? I cant stand my Urgot mastery anymore

I used to main Urgot when he was unique and fun for me, after the rework hes just another mid ranged bruiser (cool execute though lol) and it kills me that I need to grind my other champs to above 241k mastery points to hide my shame because after testing the new Urgot I've basically never touched him

So is there something I'm missing to remove the champ from my top 3 or can I demote it from M7 to M6 so its not up there with , and

If not then I've got a LOT of grinding to do