Attached is the melée version. The spell gems are replaced by a full set of inventory slots, slightly larger than the caster version.
Unzip this onto the old version. It has a new UI_Basic_00.ini file that puts the new panel in the right place.
This will muck up the original, so if you want to use both versions, unzip the basic set to two different directories and then patch one of them with the melée version.
EDIT: The Jan 9, 2003 patch broke pet windows. Please use the updated patch:
Patch for XymUI, melée version