I tried this conversion when I first bought my 08. I used LED bulbs in the marker lights and was not able to see them flash with the stock headlights on. I added a HID kit and they completely drown out the visibility of the marker lights flashing. Finally I opted for a one off set of block offs with the signals flushed in them. Greggs Customs makes a set of block offs with signals - check them out if you are planning to go mirrorless.
"All that is necessary for the triumph of evil is that good men do nothing." - Edmond Burke (1729-1797)