Relaunching the old version of champions

I had been played Fiora for more than 1000 games. I really likes her and I got all her skins. The new fiora is ok, but I really miss her ult and the quick combos. It would be great if we can still choose her old version to play. It can coexist with the new version. Maybe simply clicking her icon in champion select, so it will open a new dialog contains her old and new icon to choose which version of her will be used in the next game? It doesn't have to be in the ranked mode, It can be start with PBE or custom mode. It also works on all these renewed champions like master yi or Sion. It is good to see the old one versus the new one in an actual game.