A bit of an answer…Try this:
1.Open up your OS X Hard Drive.
2. Go to the View Menu Bar and select “Customize Toolbar.”
3. If it is not already not there, drag “path” to the Toolbar.
4. From then on, once an item is highlighted, all you need to do is click on the “Path” icon that is now toolbar, and the path of that file should be revealed.
But what it takes to remove those items (fonts) installed or owned by the system and whether they can or should be removed, well, I dunno. So I too will await the solution.
Sorry for the partial answer.
Harv