Sounds like you are right on top of things getting him the exposure he needs.
As for the two-way question: that will be answered by the coaches who recruit him more than your or your son. He will obviously play both ways in high school since he is such a good hitter. In showcases there is no problem with presenting as a two way player. In travel/tournament situations, that will be up to the coach.
When he gets into full swing recruiting wise, coaches will make their own judgment as to whether his bat can compete at their level. A lefty pitcher at his age throwing mid/high 80's will get noticed, and as others have said, is easily the quickest way to a roster spot.
But there is no reason to decide at this stage about the two-way issue. In the end, that isn't going to be his decision anyway.