How about your son emailing some Canadian college baseball programs, explain the situation and ask how the process works? He might create some interest just from his email.
The email should go directly to the coach. Follow up with a phone call if the coach doesn’t respond within a determined period of time.
Most of these are in the east (5 best programs 2021)…
https://www.fishstripes.com/22...l-colleges-in-canada
Here’s Guelph’s schedule. It will provide an idea of what colleges have teams. They played 32 games … in the fall.