As soon as I was happy with the posed fur and hair I started to texture the socket, which was only a rough blockout at that point. The last things I did were the lighting and some adjustments on the hairs later in Nuke.
The solution was quite simple: creating a second UV set that uses only one patch. After that I had some problems with caching the xgen information out. In the end I converted the xgen primitives to interactive groom and cashed it out there, which was a good solution for me in this case.