I havent done this for real, but I just whizzed through the P&D wizard to investigate.
(I use a 3rd party installer)
You can 'Add Files' to your setup.
You need to drag the font out of FONTS to somewhere else.When you do that, the copied file has a .ttf extension.
Then you can add files of type "*.TTF"
When you do that, the default installation path shows up later on as $(FONT) which should equate to the target system's font folder.
Try that, and tell us if it does not work.