I'm confused Hannah. Has your younger son had an OT evaluation?
I know many children who have received OT specifically for fine motor delays and problems with handwriting. None of these were SPD treatment. Rather, they focused on strength and coordination concerns. I would suggest you don't express there are about sensory problems and instead state specifically that you are looking for an evaluation with fine motor problems with handwriting.
Personally I've never been that concerned that therapists or physicians agree with me about everything. How they treat other people has nothing to do with me if I'm pleased with the specific treatment I receive. I consider it my responsibility to clearly articulate what I need and set the boundaries for treatment.
