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If I understand you correctly, this excerpt from IEEE 1100 "Recommended Practice for Powering and Grounding Sensitive Electronic Equipment" is most pertinent:
9.10.12.2 Special Forms of Earth Grounding Electrodes. The use of any separate, isolated, insulated, dedicated, clean, quiet, signal, computer, electronic, or other such improper form of earth grouding electrodes for use as a point of connection of the IG EGC is not recommended. These improper IG grounding schemes do not meet code requirements for effective grounding. The generally perceived need for an isolated earth grounding electrode scheme in relation to the IG method is not based on good engineering practice. Isolated earth grounding electrode designs have no means for limiting the potential developed across the intervening impedance in the commonly shared grounding medium (e.g., earth) when a current is caused to flow through it. As a result, lightning may create conditions of several thousands to tens of thousands of volts between two (or more) such earth grounding electrodes. AC system ground faults may create similar problems in relation to the ac system's nominal line-to-ground voltage and the fault-current magnitude.
In short, your electrician doesn't know his code (at least in the US) and your idea is not recommended. Nowhere in this IEEE standard are grounding systems not solidly bonded together (in one place, typically). You may have a surge protection grid, equipment grid, signal grid, etc., but in the end these systems all get bonded together SOLIDLY. Best insurance against EMI, along with an underground room at the North Pole.
Perhaps you could start at the beginning, and describe your EMI concerns / problems, and those could be resolved with more traditional solutions.
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Interconnect-screen to earth?
