It's doable and a popular modification in Japan. It won't be cheap, though. You'll need the EPS rack and controllers, the power unit, all the wiring harnesses to make it work and the second speed sensor for the transmission. I'd say about $10,000 all-in. You should reach out to NSX Rack Repair and they might be able to help you source the components.
*Edit* You'll also need the EPS-specific U-joint to connect the steering rack.