PMR is so poorly understood by any professional since they don't know the cause. You need to understand that PMR could possibly be multiple things causing the inflammation and not just one thing. They do not know. I would think that if a holistic approach were to be successful it would be more the luck of the draw than real knowledge of the cause and treatment based on that cause. The only treatment is simply an anti-inflammatory, which actually is what I would consider more of a symptomatic treatment than a causal treatment. Something somewhere in your body is causing the inflammation. That alone tells me there is a lot not understood about PMR, and no really significant progress in treatment approaches in forever.
Any approach that gives you relief is a successful approach.