Sort of reminds me when I was doing the CAGRO job at BRM for a spell,
One Sunday arvo, a nervous- sounding student pilot was being sent on her first solo, which she completed very smoothly.
Several pilots offerred congratulatory calls as she was taxying back in, inc. the parked NationalJet RPT - made her day.
T'was just a nice thing to do 'at the time'.
Nobody got upset at the 'extra R/T' at all.
I made sure she got a copy of her 'Flight Progress Strip' denoting 'First Solo' - just for her logbook / souvenir book.