What about creating an 'age' that's not really an age per se, but rather a small town in New Mexico. It would be an interesting twist to Uru, IMO. It could be a nice in-game in-character setting for storylines that might take place partly in a non-D'ni location.
I'm not sure what to call it yet, but here's the basic storyline:
[name] was an unknown backwater town in rural New Mexico. But since the modern rediscovery of D'ni, [name] has become a popular spot for explorers to buy food and water, as well as lodging and general modern neccessities.
But the citzens of [name], all 214 of them, aren't that enthusiastic about the strange new folk invading their ever-quiet community. The explorers have put a strain on the economy, and drawn unwanted attention to the town. Will the locals be able to accept their new reality as a link between the Surface and the Cavern, or reject the presence of explorers all together?
Who wants to come along for the ride?