If I have erosive oral lichen planus (OLP), can I get Rejuvagum or LANAP without doing root planing first?

Due to erosive OLP, I've begun to see the roots of my back teeth exposed. My insurance co. would only consider covering GTR / Rejuvagum if I first did root scaling and planing (RS/P). I hesitate to do so because my gums are delicate / sensitive (& RS/P seems meant for erosion due to periodontal disease, not an autoimmune condition). Can I, or should I do GTR or LANAP therapy without it? Or Lanap therapy instead of RS/P? (And finally, would using lasers on my gums be a bad idea?)