Unless I’m misinterpreting the 190 patch notes, I think that by using the remapping, the spawners should spawn my new trees/rocks/crystals once all of the olds ones are dead. Theoretically, at least.
EDIT: I looked at several of his videos, and it looks like the clutter layer is just about map clutter, and not actual resource nodes. I saw the video on resources, but it appears that they’re painted onto the map. I still can’t find a way to remove even a single one of them, but now I’m worried again that doing so would permanently remove them.