Let's start with the question of how much 240V single phase power do you have available? A 40HP motor is going to need about 200 amps of 240V single phase. You also need to confirm that the pump motor is wired for 480V. The fact that it came with a 208/240 transformer would cause me to check the motor wiring first. But assuming that the motor is 480V only, then you would need a 240/480 transformer after the phase converter.
Then a Phase Perfect or RPC of the proper size would be my choice for that application. I think any of the vendors you listed would be fine.