Maybe you will have to approach it a little differently than other baseball players. Find the academic schools he is intersted in and approach those baseball teams. I think regardless of what they say baseball coaches recruit baseball players then students. In your case maybe a dyslexic approach may be better suited. In other words....
Find some schools that your sons baseball abilities are in par with
Apply to those schools
Notify the coach that you have already applied and include the adademics then ask about the opportunities to be recruited as an athlete also.
Getting the academic issues initially resolved can be a god sent to a coach and they may be more receptive.