I have tried and would strongly suggest staying away from a noose type hanger. I think a ADS as suggested above would be more productive. The springs give up to 5? pounds of tension. That being said, I hated my extender. It requires three hands and a prayer to get into one, uncomfortable, and if ya have to urinate…Anyhow a lot of people have used them for for a year or so for slight length gains it seems. Everyone is different and in different situations they must deal with.
This is a very interesting idea, although I think you will have to make your own. I have thought Theraband and a thigh strap. maybe a little para-cord would a good extender. Your idea has much merit, it would fill the seeming gap for something low tension over long time. If you could make something easier and more comfortable with the same effect of the typical extender, I think it would not only be awesomely useful, but marketable. I hope this thread takes off and some pros give their thoughts.