The Bellari schematic you posted looks "suspect" in more than a few areas. I see several "that will never work" aspects (like weirdness on the primary of the input transformer, no DC return path for the cathode of V1A, no DC return path for pin 3 of the upper opamp...among a few things).
That said, the phantom connections are conventional, and input transformers with faraday shields have been in use for decades. The faraday has no DC involvement with either the primary or secondary.
Tie BOTH the can's shield pin and the faraday shield to CHASSIS, not "audio common/0V".
Two other points. Be sure you mod/add the 100K resistor in parallel with the 10K/100 pF series string as called for in the Cinemag spec sheet. That's what "tames" the HF response of the tranny.
If you have room, wire a 100 Ohm resistor in series between the "output side" of the phantom switch and the node where the voltage feeds the pair of 6k8 resistors, then add a capacitor, at least 100 uF/50V, from that node to ground. It will slightly slow down the voltage spike that occurs when the phantom switch is engaged.
Bri