Neat, but what I really want is a dynamic abstraction layer above this, similar to DNS. I'd like a unique code that translates to a physical address (or a system like this, or both), but is adjustable by me.

Verified by sending a physical card to the location, adjustable by the owner, query-able via an API. Post-offices can perform a lookup and calculate postage fees in this way.

Voluntary nomads (techies) could subsidize the service for involuntary ones (refugees).