It’s hard to believe that completing FAFSA takes you “hours and hours,” especially if you already have experience working through the form.
If your son won’t need/doesn’t want the federal direct loans and work study, and the $500 grant isn’t worth it, than I don’t see a reason to complete FAFSA for him. But really, FAFSA should take about 30 minutes max for you to do. $1,000 per hour is pretty good pay.