Or, float the input and output sockets on the paradise, so signal gnd has no chassis bond. And run the chassis back to mains 0v via a DDRC.
If there's continuity between gyrodeck chassis and tonearm you don't need another gnd just that 3rd wire in the arm.
If there's continuity between gyrodeck chassis and tonearm you don't need another gnd just that 3rd wire in the arm.