Is your son a rising junior then? I think a HA showcase in the fall is a good move. HeadFirst is ideal for direct communication with coaches so depending on how comfortable your son feels talking them up, he may need some prep with that aspect :-). He should reach out via e-mail to coaches who will be in attendance.
I would also explore playing in the Junior Fall Classic in Arizona - it is highly scouted and given the timing (October), coaches could possibly get two looks within a couple of months. I have attached a list of schools that attended last year. You can apply for the All-Academic game try-outs without playing on a team (but try to do both): https://azfallclassic.com/junior-all-academic-game/. My son did these events last year so if you have any questions, please feel free to to PM me! He committed in February to a HA D1 school.