Many moons ago, we were faced with a similar situation and a 200 KVA load fed from 480V 3phase.
What we did is to build our own resistors. Calculated the required resistance, went to a nichrome wire chart and selected a particular gauge which could withstand the maximum inrush current, and purchased the required lengths of wire. To build the resistor, we used household bricks as the wire formers. One for each phase.
And with a simple PLC, we controlled the activation of the of the power contactor which would short out these power resistors.
In operation, the wire would glow red-hot for a couple of seconds, but that was perfectly fine.
For your power level, you may want to add multiple resistor stages in series, and each would be shorted sequentially.