So yes, you probably want to pursue assessment in areas related to written expression, including occupational therapy evaluation (handwriting, fine motor skills, visual-perceptual skills). And those accommodations you've noted are quite appropriate. They equally apply to language arts, where higher-level reading is usually accompanied by higher-level written demonstration of comprehension. Oral assessment of his comprehension would make more sense for him.

...pronounced like the long vowel and first letter of the alphabet...