Choose your own profile pic suggestion
I think depending on a champions rank they should keep their border colour so if a 5 star is rank 3 they can keep it, or if a 4 star is rank 5 they can keep theirs. Please suggest how this could work in your own way if you wish. I personally think this is not too much to ask.
Also people would be able to tell it isn't their top champ as soon as they view the profile.