Cool stuff!
Perhaps one thing to think about is an SSTV transmitter such as PSAT2 That one originally had an uplink to command SSTV transmission, but the payload failed during launch. In fact, probably no extra hardware is required as SSTV images can be generated on board (university logo, satellite mission logo, etc.). It can also include the telemetry in the image itself (the telemetry is the little code on the bottom)!
Good luck with your satellite!