How to Unapprove a Shooter?

Is there a way to move a shooter from Approved (but not paid or squadded) back to Unapproved without withdrawing them (would be a bonus if they went back to the waitlist)? Alternatively, can I tell what day/time an approved shooter was Approved?

I’m having a problem with shooters taking up a spot in the match that aren’t paying/squadding after approval, while I have other shooters ready to shoot on the waitlist…