Its true many regulators have stringent requirements on earth leakage protection. However, they may or may not specify the 'sensitivity' for earth leakage protection. RCDs / RCBOs / ELCBs come in various 'sensitivities' - 30mA, 100mA and 300mA being most prevalent. 30mA ones are the most sensitive and are generally used for household appliances, lighting circuits, etc. where human intervention with the equipment is high. 100mA or 300mA are most suitable for your application where the 'normal' leakage currents are high and human intervention is less, e.g. saw mills, welding machines, furnaces, workshop tools, etc. I think you also get RCDs with settable range of operation, which might help your cause further.
Hope this answers your question.