I sort of had in mind me being a full Lieutenant, with you having been one a few months more than me, making you the highest ranking officer.
True, his counterpart could be alive and well, that works. The Defiant class would exist in the Mirror Universe, be just as well armed, the same size, only no agonizers on the USS Sydney, natrally. Their purpose would be patrol duties, and suppliment the larger warship classes on pacification missioins, as well as when aquiring more territory for the Empire.
Ok Trieste, if you feel this fits better in the socialising forum,who am I to argue.