Just like it says. Create circumstances to have Virginia and West Virginia as a whole state again even after West Virginia's statehood gets Supreme Court approval.
Maybe the war drags on longer and/or reconstruction is far more radical, with Virginia being dismantled as a separate state, and being completely integrated into West Virginia?
It seems very unlikely, but I suppose it could be done.
Extremely difficult to virtually impossible. The problem is how the war ends. If the North wins then it is hard to see why they would punish loyalty and reward treason. If the South wins (Very difficult in and of itself) it very well may have to give up WV and quite likely TN to get the peace treaty. Even if not Virginia is dealing with a population that is very hostile to it, in an extremely good defensive position due to the mountains, and as well trained in fighting as any other state. Even RE Lee gave up on WV very early in the war.