I don't think such a script exists, but it might be something that could be added to BOB, or BOB could be stripped down to do this. As an addition to BOB, I see something like a Map Inspect Lock toggle, so the Map Inspect highlighting could be kept on after the mouse has been moved from the hover point which turned it on. Then you could hover over your own name, which would cause the boxes to appear around the territory that are safe (unseen).
And another thing, for example after me plays one opponent, i'd like to know what territs he doesn't see, despite third opponent may see my territories. It would be useful to know who in a game sees what, of course you can manually check but on maps with many territories it would be a good addittion
something like text map would be cool, so next to the map is shown textually what territs each player sees