Kill markings can be substituted with the Luftwaffe insignia on their aircraft. Substitute the swastika markings with the plus-sign style marking such as the one on the Ju-88 wing.
The noseart can be covered with, like Knite said, a bikini. I believe Kev367th did a nude noseart, but covered it just enough so that no "offending bodyparts" were showing, but the skin did not look too far from the original.