It’s possible and they’ve done it a few times already.
+The writers can ask a kid if they want it to be known he was on campus.
+Recruit does not go to the area/tent in front of the stadium.
+Visit practice and skip the game (mid-week practices).
Ultimately, you’re right. This always gets out since someone sees them in the student section or at the stadium. The higher the profile and the more recognizable, the less chance you have of getting the visit to stay under the radar.
What the coaches don’t want, is for the media to **** around and blow it before the visit even happens.