If he wants to make memories playing football and wants time, I’d send him somewhere else and then attempt to transfer to BYU as a grad transfer. They are often sought after. Dylan Collie is better off because he went away and then came back.
A few years back a guy few will know named Dalin Tollestrup set some school records in Canada and post mission decided he’s rather get to a better environment at BYU, but never saw much playing time.
You never know exactly how it will work out.