Karnapidasana is recommended by B.K.S. Iyengar for people with ear pain. The name itself talks to this: karna = ear; pida = pain, or pressure; asana = posture. In his book,
Light on Yoga, he recommends holding the pose for 30 seconds to one minute, but this is after doing Halasana (Plough Pose) for one to five minutes. It is the inversion that is therapeutic, not just the squeezing of the ears with the knees. (If pressure on the ears was all that was required, you wouldn't need to use your knees to do that, you could just use your hands while sitting to do the same thing.) In another book,
Yoga: the Path to Holistic Health, Iyengar recommends simple inversions, like Viparita Karani (Legs up the Wall Pose) for ear ailments. So again - the inversion is the key to healing.
In the Yin Yoga repertoire, you can try
Snail or
Wall Caterpillar for 3 to 5 minutes at a time, and see how it goes. As always, go easy at first and really pay attention to the affects of the posture. While you say that you can easily come into these postures, if you are not experienced with these poses, it is wise to err on the side of less is more in the beginning, and really check how you feel during and after the poses.
Good luck - and let us know how it goes.
Bernie