I really enjoyed this entry. The best part for me was the idea of "shunting aside" the land in which this nation appears. You'd have to impose some rules; no appearing indoor, underground, or underneath a physical roof of any kind for example.
But, imagine the fun! The nation appears in a castle court yard and suddenly it's a 200 mile trip from the castle gates to the door of the keep; 314 miles if you want to circumnavigate this interloper (pi * 100 miles). How does it work? What does it look like? I don't know but let's assume that it is "real"; suddenly the walls of the courtyard are 628 miles in circumference.
It inspired a kind of "Great Train Robbery" scenario for me. A group of thieves wants to loot the impregnable treasury of the empire. A small group makes their way into the Tara Akalei. Their plan: infiltrate the castle where the map is located and hijack the nation.
At the same time, a group of their compatriots has broken a tunnel through the rim wall. Once the nation is hijacked, the first group places the nation in the courtyard of the Imperial Treasury. The second group rushes through the tunnel to overcome the defenders of the treasury while the main garrison is suddenly 200 miles away. With the defenders defeated they set up a bucket brigade and empty the treasury.
Adventures: foil the plan, defend the map, defend the treasury, recover the loot (after the fact and after the city has been moved somewhere else), or, perhaps, the PCs have been recruited to be the thieves and implement this cunning plan.
Anyway, I don't know how this fits in the vision of the original author but it really inspired me. Cheers!