Manually resetting UWorld::OriginLocation and UWorld::RequestedOriginLocation after some point it is possible to make something like wrapping world. Did not test, but it’s unlikely that navigation will be affected (source usage search shows up only one suspicious place with something about particles).
“But online?” (C) Visceral3D
Didn’t touch any multiplayer features of engine, problems will rise already at UWorld::SetNewWorldOrigin which do not work for multiplayer. Maybe some consensus algorithm can be utilized for all groups of interacting characters to use the same origin location. I can share source with willing souls for testing and generalization purposes.
And if anyone would care for details of singleplayer implementation, I can write out a tutorial.