I have written a little perl script that allows to automatically make XEP aware of all fonts installed on your system.
This script searches for AFM and TTF fonts into provided paths. It then generates a modified xep.xml configuration file. Optionnaly, the script can also output a sample FO file with all found fonts and transform it to PDF. Some details:
Usage: groupfont4xep.pl --conf </path/to/xep.xml> [--out <sample.pdf>] <path1> <path2> ... The script creates a "xep-new.xml" file in current dir Options: --help - shows this text. --verbose - self explaining. --version - shows version number and exits. </path/to/xep.xml> - the full path to XEP configuration file <sample.pdf> - Name of output sample PDF file (optional) <path1> <path2> ... - The paths where to search for fonts
You can download the script here, it's under GPL license. This is meant to work under Linux, at least.