Resetting a Zone property everywhere on the map

I would like to reset a Zone property everywhere on my map (it controls the display of discovered / undiscovered zones per player). My current plan is to have Invisible 1x1 resetter counters in every zone (with Control-R setting the CurrentZone property to “NoHighlight”), and players dropping “Discovered” counters in each zone when they do discover it. A global key command restricted on some setting (the name of the player’s country, which would also be a marker of the “Discovered” counters) would make the zone be covered by whatever color I decide to be for “Discovered”.

Is there a penalty to setting a highlight name that does not exist in a zone? Especially with many zones? Would my solution work?