My brother Diamond, I fell from Platinum and now I can't play with him

I know you changed system so lower elo players can't meet higher elo against them. But may be there can be some possibilities? Like both players press huge button "AGREE" and face players from higher elo? Gold + Diam will face Diam? Probably this won't be good for other players in our team ("why we have lower players here with us?"), but it's ridiculous - I can't play with my own brother, who sits in next room T_T.

I don't like normals and my brother either because there "race for win" is not so strong.