Dewalt has a similar router model available for the UK that is 220 instead of 110VAC, you can find its information at Dewalt 611 uk version. I believe it’s the same dimensions so the Inventables spindle would hold it, but you should verify that with either Inventables or someone that already has it.
As for the steppers, the NEMA 17’s may not have enough power or torque to move the Dewalt at a decent speed. If the price difference isn’t too much, I’d recommend the NEMA 23’s just so they can keep up with the weight of the Dewalt and the speed at which it can cut.