Are you sure it won't work with 50HZ? I doubt that such a high-power device uses a synchronous motor which depends on line frequency. And even if it is affected, I don't think it will slow down the dryer that much.
Getting a dedicated 110V line in Europe is pretty much impossible I guess, with maybe some exceptions. Where exactly do you plan on going?
I don't know for other countries, but in Austria used spin dryers are available almost for free.