Are there third-party keyboards that have the Apple layout?
Yes, there are several companies producing keyboards with Maclayout, e.g. Logitech: http://reviews.logitech.com/7061/4741/logitech-dinovo-keyboard-mac-edition-reviews/reviews.htm, and also Keysonic: http://www.computerbild.de/artikel/cb-News-PC-Hardware-Keysonic-ACK-540-MAC-RF-Spezialtastatur-fuer-Apple-Rechner-3364609.html