Grafting technique for production using Opuntia
The video is pretty concise.
It shows a methodology of grafting other cacti to Opuntia.
Other cacti as well as Pereskiopsis can be used in the same manner.
More on Pereskiopsis
https://en.wikipedia.org/wiki/Pereskiopsis
Link from the Video.
There may be a bit of a language barrier.
http://cactusinfo.nl