Why don't you simply power it through an inverter that will output 60 Hz, eventually
even "down to" 120 V , true sine wave, of course ??? They are not that expensive
by now.
And be carefull : motor designed for 60 Hz, running "under" 50 Hz, OR THE
OPPOSITE, I do not recall !!!, display a significant reduced life time.
I have to check which is which, but I know this is a question of saturated magnetic field.
Better check first.