This again? There is no way that a bicycle rim can stand on a spoke or 10 spokes. the nipple will simply push into the rim and puncture the tube.The spoke/rim interface is not made in a way in which a spoke could hold up the hub in this manner.

The hub is suspended in the rim by all of the spokes under equall (respectively) tension on all of the spokes. Yes, the spokes on the bottom may unload in tension partially but that is how they work together. And one more thing. The ground does not push up on the wheel. The load pushes on the hub which transfers the load to the rim via the spokes on the top of the wheel,which pushes down on the ground. The rest of the spokes keep the rim from deforming/collapsing through tension.
So, yes it can work if the "string" is strong enough, and can be properly tensioned or if the rim is strong enough to not deform.