I assume he could just try out?
I think that's where it could get a little tricky, with him being an "import". Would have to go to a team with an opening for an import, etc. But would have to think he's attractive to many teams now.
I know some preliminary USHL camps happened a month or so ago, but I'm sure he could still try-out in pre-season camps later this summer/early fall.
Very few players go directly from prep school to college anymore - they just aren't ready for that level coming straight from a high school setting. Would think Providence College wants him to go USHL too - they could possibly "help" place him on a team there too.
BCHL could be another option....