I would not dismiss learning how to perform a Yoga Breath on the basis of Maynard Ferguson. Bobby Shew has a version he calls Wedge Breathing.

Just because Maynard has chopped chops and Bobby was obese when I was at a clinic where he tried to teach the breathing technique, this does not disqualify any benefits you might get from a Yoga Breath or Wedge breathing.

I will leave it to Greg to guide us on whether or not the techniques are applicable to playing the trumpet, but I will also hedge by saying, as a competitive athlete for many years, almost any structured program to improve breathing will likely help in some area of your life.