George, yes I am sure Ed had lots to say about it.
Jon, Class A GFCIs (people protection) are only available up to 6mA and 240V. There are some manufacturers that make non-Class A devices for 10mA and greater currents up to 480V. There are breakers with internal GF protection but they usually start at 2A and go up from there. Most mA rated devices would not be practicle due to the normal system charging current.
One problem with your method, is there is very little ground fault current flowing as a result of the first ground. In fact there might even be less current than normal based on the amount of coupling capacitance that is "shorted out".
