[zachfishman]

In the past I've taken a cutting of a gorgonian, stripped the tissue off a small length of the axis, then glued the barren axis into a hole drilled in a frag plug/cube. In the laboratory I used to work in, we even zip-tied gorg frags to stainless steel nails driven into the reef.

IMO the easiest way would be to superglue the end of small pieces into crevices of LR rubble.