Telemed with a doctor could work. A document of recovery is document from a doctor saying it is okay for you to travel, go on a cruise, whatever. She should have experience with that. A home test, if proctored and documented should also be okay, but not an unmonitored test.
It could subject you to delay and questions at embarkation.
Since you are vaccinated, I would take a self-antigen test a few weeks before the next cruise to verify negative, and then again within the cruise testing window. The PCR tests could show a false positive. If the antigen test says you are positive, you almost certainly are. Since this may start a spirited discussion, ask your doctor during your appointment.