Shop air dilemma

If you are handy, look up DIY Rotary Phase Converter. You generate three phase power off your single phase by running a three phase motor and hooking up in parallel. I have a 5hp in the garage and a 3hp in the basement. Usually want a slightly bigger motor for the generator than you are running. Can be as simple as a rope pull start or several types of remote start. Mild to wild. Commercial ones aren't cheap but you can run several machines off them at a time and every now and then you can find an orphaned three phase motor.