If he’s a strong D1 recruit, would an athletic scholarship be a possibility?
I think you have to go through the recruiting process, and when your son gets an offer/is close to an offer, talk with the coach about finances and any financial aid, merit or athletic money. Some schools do financial prereads.
It seems like nothing except maybe engineering, is set in stone, which is why I vote for casting a wide net at this stage.
It is probably a good idea to get clarity about playing soccer in college. Most college athletes REALLY want to play in college – as you know, it’s such a demanding path to get there, and once at college it continues to be very demanding. So you have to want it. Does he want it? If yes – go! If not, why go through the hours of practice, the travel, the angst? I don’t know any college soccer players who thought they could take it or leave it; they all wanted to keep playing, badly, and at the highest level they could.