The fitting system is no where near as important than an experienced and talented fitter. Technology does not matter if the user cannot think outside the box or have experience with people with physical issues like you, and me.
Check to see if there is a local cycling group who can give you a recommendation. You need someone who can think out of the box. You might also want to see if there is a PT who is also a fitter, I know they exist but not how common they are...