Same here, my pump bracket was included with a Blackburn pump many years ago. (I carry the Road Morph G or Lezyne Micro Floor Drive for touring but around town where possibility of theft is high, I instead carry the cheaper Blackburn in that bracket.)

On a different bike that has a pump peg, I carry a cheap Zefel that is similar to the HPX. (But when I tour on this bike, I also carry a Road Morph G or the Lezyne pump in the pannier, as I prefer to use those pumps.)

If you see a pump bracket that looks like it will work but find that the pump is slightly smaller diameter, I put a bit of inner tube rubber over the tube on both my Road Morph and on the Lezyne pumps so that they will fit better in the Blackburn bracket. The Blackburn pump was slightly larger in diameter.