Yeah less horsepower I think what fromport was referring to. Seems like you'd just have to buy a bigger spec generator than needed and then set the governor RPM lower (to get 50Hz) and do some testing with a prototype to confirm it could meet all the demands otherwise. You can fine tune the voltage with the AVR regulator adjustment if it dropped by a slight amount.
But that could be costly to pay workers to have to modify 80 generators, which might void their factory warranties as well... Doesn't seem worthwhile unless she (ghostrider66) wanted to service the warranties on those 80 units instead of the manufacturer.