So then I started practicing only variation for Parshvakonasana B and Marichyasana D. She allowed me to do it and so my ego was very happy as I was "able" to practice the all series.
I had to run downstair and show it to Trupta. Of course it is not the perfect one but a least I can twist AND bend at my knee WITHOUT ANY PAIN at all. So yes it is possible.
No Ego during Asana practice
As a result my practice is stopping at Supta Kurmasana. Since I have been seriously practicing it I feel pain in my lower back and I do understand it. Daily I am asking my body to bend forward with an external rotation of the femur bone in order to try to bring the feet behind my head. For it I need to lengthen from the lower back in order to give more space in between my hips. It will take time but it has to come naturally, no need to push.
If you are breaking the lock then you won't be able to close the door again, it is a one way useless solution.