Been struggling with this for a couple of weeks. Knew there must be a trick to it that I was missing. In the end it was obvious. I've been focusing on my foot placement and forgetting about my thigh and knee. This time I brought the right thigh and knee close to the other leg so that they were almost parallel, that allowed me take my foot over my knee and twist into it more comfortably.
I was able to work at grounding the right knee a little more which made the whole posture more stable. Still a way to go with it, need to work on getting my left sit bone more grounded as well as stretching up through the pose, bit hunched there. But it's stable enough for five breaths and all that will come just as it did with Mari D.