If learning foreign language has been difficult, it is likely that the underlying cause of your son's dysgraphia is a sequential processing problem (learning, remembering, organizing, and expressing detailed information). Any foreign language will probably be difficult, but his background with Latin may translate well to another Latin-based language such as Spanish. But you may also want to see if his particular college offers American Sign Language as an option. If so, that may allow him to utilize his stronger conceptual and "hands-on" learning skills and require little if any writing. I've included a link which shows which states accept ASL as a foreign language (or are at least moving in that direction).