Contorted flavors in grand unification and proton decay

Conventionally we collect electron and up/down quarks (u,d)⊕(νe,e) to form unified generations, and collect the left-handed and the right-handed fermions of the same flavors (νe,e)⊕e¯. We can alternatively have a contorted multiplet, made by pairing different quarks and leptons, like (u,d)⊕(νμ,μ) or (u,d)⊕(ντ,τ), and/or between different left- and right-handed fermions to (νe,e)⊕μ¯, etc. These can suppress proton decay, due to its high flavor dependence, while having the correct fermion masses.