I have a video that goes through a whole sun salutation with ankles crossed. Really good and interesting. I don't know the sequence by heart, but I can find it for you if you want - but I can say that upward facing dog with ankles crossed gives me BIG psoas stretch. Still might be too much lateral strain on your knee? but at least it doesn't need knee flexion.
There's that one where you lie on a table and let one leg hang off, too. (I just don't have any place I can do that one.) If it's not too much to let gravity flex your knee somewhat.