Only way I could think of (instead of reinstallation) : edit/change/tweak/mod some files as well as .ini files in the DATA Folder in your Freelancer now Crossfire installation.
But ... pls don't ask me which ones, I really don't know. (never took a deeper look into this only that it's NOT easy editing )
And ... even though it would only have an effect the chars appearancce in SP/aka what you see on YOUR screen without effects to MP,
you shouldn't do this (modding the mod, remember the 'legal disclaimer' during installation ? )

Edit by Forlon
And such editing will (almost) for sure end with ban on server ...