4. The attachment point at the bottom of the standard stake would have seemed to work except for the tendancy of it to pull the stake directly up if the line does not cut completely through the ground. If it doesn't work in my situation, I can't see it helping anyone in any firmer ground. In the desert or snow, sure, but in firm ground not so much.
UNLESS, (and I am kicking myself for not trying this) have someone stand on the stake while the line is pulled all the way to the bottom and cuts completely through the ground. Still seem far fetched for most of you, but in the soft ground it may work.