Hi! I am sorry to hear that you have an injury that affects your guitar performing. If you haven't already, I strongly advise you to find the best sports medicine doctor or one who is familiar with repetitive stress injury or the types of injuries that musicians most often incur and get their diagnosis and opinion before proceeding in rebuilding your guitar technique.
You definitely can learn the Carlevaro technique as once you start moving your fingers with his concepts in mind you'll get the idea because it feels better to play the guitar in the way Carlevaro suggests- it is very intuitive. I went to the University of Arizona where I studied guitar with Prof. Thomas Patterson who had actually studied with Carlevaro and so I have spent a lot of time learning the different exercises in Carlevaro's books for the left and right hands. They work.
YouTube video Maestro Carlevaro goes into quite some detail explaining his thoughts about positioning the guitar and the various functions of the left and right hands: https://www.youtube.com/watch?v=-XbUkcjuMds