So I’ve been thinking about if there’s a tool that lets you make a world where only certain biomes appear (for example, only sunflower plains, dark forest and river biomes would generate) and/or kind of ‘paint’ biomes. Not worldpaint kind of stuff, more like single biome worlds but it can be multiple biomes. It’s hard to describe but I hope you get what I mean.
Is this a thing that exists?
I would suggest looking at datapacks for anything similar. It’s insane what can be done in them, so I wouldn’t be surprised if they could do what you want.