Why not explore the possibility and doability yourself by positioning one of your legs as noted and checking for accessability. I think you will learn that while this position is novel it isn't going to provide the openness you imagine. This does not matter. Just try it with her and proceed from there, modifying or changing positions if need be. This ain't rocket science. Making love is a partnership, it is not what we do to each other; rather what we do with and for each other. Explore and learn together!