My daughter and I happened to catch a lesson by Mike McConkey of edible landscaping on how he roots blueberries (non-dormant). It was similar to the video above, 6-8” terminal branch, trim them back to the top couple of leaves, and just push the stem into a 4 inch pot. He used a potting mix rich in compost that he formulated, but i seem to remember peat was also suggested as a possibility. They then go into a warm greenhouse with intermittent misting.