One can only hope that deliberately violating the State's Constitution backfires on the then governor whom signs the bill. When state courts insist on enforcing the Constitution, Republicans will have a governor to veto the next bill the legislature tries. That would be the dummymander to end all dummymanders.
Meh. If the court decides this violates the constitution, then there isn't much the Republicans can do to hurt the Democrats anyway as they will be just as constrained by the constitutional language as the Democrats are. (And you are making a rather grandiose prediction that there will be a Republican governor and state legislature--dubious at best.) I think this does violate the constitution, but the WV Democrats really have nothing to lose by trying.