I would like to operate machine shop tools. Heavy duty drill press, milling machine, lathe, etc. Used/resharpened drill bits with a Morse taper that are typically used in 3 phase machines are much cheaper than reduced shank drill bits. 3 phase opens up a whole new world of machine tools at reasonable prices that are built a much heavier than single phase machines.
Plan B is to buy older (heavy duty) single phase machinery and rebuild or go through some sort of converter or replace electric motors as suggested.