Can you just break off a limb and put in water to start roots?
How Do You Get Starters From a Pyracanthus Bush
Certified GKH Gardening Expert
Pyracanthus or Firethorn is a great candidate for propagating.
You will need to follow the directions in the link below.
soil thst is keep most is better. put several in a pot, with lowest leafs and thorns removed, then you can choose the strongest. rooting power will also help but is not nesacery.