Could you add a secondary outlet that taps off before the isolation transformer, and include a ground? I mean, like if you were to buy a panel mount outlet, like
this and just run the wires to the power and ground before the isolation transformer, then when using a monitor that requires ground, you can plug it into the receptacle, as monitors that require an isolation transformer should never have a normal outlet harness, buy you could just put a note on the panel that its not an isolated receptacle.