by european layout, which one in specific do you have in mind?
I been around the same lines for months, and thought a lot about, the best option, which is no longer an option anymore is to try to get an old Das keyboard III not the model S with the european layout 105 keys. It haves the media keys support, and everything you want, but this is no longer sold, and the whole series was dragged back to DAS due some problems, and then they released model S but without the media keys.
Depending on how important is the layout for you, I would recommend to get a regular keyboard, and beforehand test autohotkey functions for media control, so that is no longer a requirement at the time of your search.