Update: I bought 3 VFD's for each of my tool and for the air compressor, unless the motor is completely unloaded (meaning no back pressure during the startup sequence) the motor will not turn over but instead just turn slow in ways that sounds bad. If the motor starts without a load, then the motor will turn over, and the output can pressurize the tank just fine. So I'm selling the VFD as the postal service is giving me a lot of trouble to return the item to China (basically could be months of waiting with no news). It only weights like 2-3 lbs each so if anyone here want it I can send it over to you for a reasonable price... though the instructions are all in Chinese...

Someone sold me a 10HP or so (it weights a ton... 2 people couldn't pick it up without mechanical assistance) rotary phase converter. So I'll just use that...