How about a variation of what your talking about? I like to use Bungi cords and a Bib Hanger SO or SU. It kind of leashes you down for a while but the advantage is that while hooked up you can twist your hips to just about any angle you want from OTL left to OTL right. Then to get some mean lig stretch just push down with your thumb on top of the lig and you’ve got a fulcrum stretch or to the side with the thumb and you’ve got an OTL fulcrum.
Some people don’t like Bungi Cords because you don’t have a gauge to measure weight but you can attach a cloth tape measure to the bungi and stretch it to the same length each time giving the same tension each time. Then if you want to know what weight your pulling is equivalent to just take the Bungi and hang weights on it until it stretches to the same length and you’ve got your pounds. I even went so far as to make a chart of weight vs. length so I can know exactly what weight I’m hanging with, but what you tend to do is not worry so much about what weight your at but how the stretch feels.
What I’ve found is that I can really concentrate on how things feel and if my ligs are fatigued then I can let off until I feel a good stretch or I can lean back and really break things up but I’m not having to adjust dead weights all the time.