I like the Papyrus font.
Not sure quite what you're looking for but could you use white Letraset?
Having an extra bit of paper stuck on the mount won't look as good as having the text directly on it.
You could buy temporary tattoo paper and print the place names onto that. It should work in a similar way to Letraset but instead of having to set each character you can have it all kerned, spaced and in a straight line already.
Can you cut a small rectangle out of the mount below the pic and place a name in that on white paper?
Can you cut a small rectangle out of the mount below the pic and place a name in that on white paper?