Won't work. The ISS doesn't have enough radiation shielding to allow astronauts to survive for long beyond the Van Allan belts. Also, it would take a VERY long time to go anywhere on the "10 Watts in, 10 micro-Newtons of thrust out" that an EM drive provides. The ISS has about 100 kW of solar power capacity - and if 100% of that went into an array of 10,000 EM drives - you'd get 10 milli-Newtons of thrust out. The ISS has a mass of around 400,000kg and needs about 10m/s of deltaV added to it every couple of months just to stay in orbit.
There is no way for EM drives to do anything of use whatever.