Following will be an updated rc-scripts-1.4.16-livecd.patch which mounts a tmpfs at /usr/X11R6/lib/X11/xkb/compiled for LiveCDs running X so that xkbcomp can save it's stuff.
Created attachment 50509 [details, diff] rc-scripts-1.4.16-livecd.patch
This is in catalyst now... it is pretty simple... it just looks to see if X exists and if it does, it adds the tmpfs mount to fstab when creating the livecd...