I found it.
Yes, but it’s a little involved, and you can’t take anything but you and your inventory with you (so no deathmobiles, at least not with a rather significant amount of work on top of this).
Steps:
[ol][li]Move to the surface. You have no idea what the new world will have in your new location, and getting entombed in solid rock is a stupid way to die.[/li]
[li]Pick up everything you want to take with you.[/li]
[li]Save and quit.[/li]
[li]Open up your save folder and find the 5 or so files with names that start like this: “#QmVuamFtaW4gUmVwbG9nbGU”.[/li]
[li]Copy those files over into the same spots on the new world’s save folder.[/li]
[li]If you want to take any artifacts over you will need to copy over artifacts.gsav as well (note: this can and will rewrite previous artifacts in the world as well).[/li]
[li]Restart C:DDA and open up your save in the new world.[/li]
[li]Assuming everything went right, you should be done.[/li][/ol]
Of course if your goal is to just move from one version to the next you can just copy over the entire world folder instead of just the character (compress it first though, it reduces down to about 1/8th of it’s normal size).[/quote]
Whew. Well, I can only take the items my character can carry, but I suppose that’s all right. I was in the middle of finding a new place to become a base, anyways.
On the old world, while the map is all screwed up, I was thankfully close to my base, so I can go there, wear several layers of backpacks and duffel bags, and carry out all the things I might want, including a cargo carrier and an extra light frame, plus a wheel.
Funnily enough, I spawned in the new world in the middle of a river. Managed to swim out before the torso damage killed the character.