The 12 has a reflector assembly - the plastic cover the front does nothing for beam spread and is only there to keep bugs off the reflector. ie, no you can't rotate it.
GS Monkey..... If you simply travel in Europe, what you suggest is fine. However if you want to import it, you need to have an ITV (MOT) and they shine the beam into computerised mirror system.... which fails if not modified properly.
This happened on my F650...... failed and then had to buy the LHD version.... £240... Help.
As has been suggested the 1100S has a simple rotating module.. bob's your uncles aunt??.