you can sort of do that with customized world type. In the modified game settings you can change the depth base size of biomes (the surface level that generates for terrain). If you set it to max the ground will generate at 200 filling most (but not all of the world). Rivers will become deep chiseled valleys though so you might want to make them rare. Keep in mind the game is very slow loading terrain but it will do so infinitely with all biomes doing it that way.
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