I rarely see teachers integrate a lot of teachings on lung into their explanations of meditation, but Tsoknyi Rinpoche is excellent at it. You can find a lot of it in his book Open Heart, Open Mind.
I've heard this before, thanks for the reminder.
The Tsa-Lung practices explained in Tenzin Wangyal Rinpoche's Awakening the Sacred Body
come with some great information on Lung in relation to the Chakras and Contemplation in the Natural State.
Although for them to be effective, one most likely would need to have received Direct Introduction from an authentic Teacher (not necessarily Bönpo only); but as far as I know you don't need a specific transmission to work with the said Tsa-Lung practices found in the mentioned book.
Yantra Yoga is said to be able to untie knots that have formed in the Nadis related to the Heart Chakra as well.