And then we have this from another earlier post
Concentration: the sixteen vital points
see my earlier post
Krishnamacharya's alternatives to Headstand in his third son Sri Sribhashyam's book Emergence of yoga
Which contains examples of General Practice employing concentration on vital points as well as pranayama in asana.
And example from the Book of Krishnamacharya's own practice to show how concentration of vital points might be employed.