Why don't we have as coaches a "backup option" button, we can send a recruit a "Hey I think your talented but your not #1 on my board, if other recruits fall through then you will move up and we will talk then."
Basically it tells the recruit that your not interested in recruiting them at this time but depending on where chips fall they may become your target again.
This in turn can give the coach 2 different emails either
1- "I'm better than your #1 option and its sad you can't see it, good luck but I didn't like your school anyways."
or
2- "Thanks for being honest coach, I'm hoping to talk to you again soon and good luck in your search."
Then BAM recruit stops considering your school and the coach will know right away if he can ever come back and pursue that recruit in the future.