Using Fractal Terrains to make a flat world?

I am working on a world map for my home tabletop/writing setting, and for the longest time I have rolled with the idea that it is a flat world. Not completely flat, as it is dome shaped and has a horizon similar to earth, yet is only about 20% the surface area of Earth.

I am want to use fractal terrains for this because of the extreme level of control I can have over terrain and elevations. However, it obviously assumes a spherical planet.

Is there a good way to make a flat world and use wilbur to do erosion and whatnot, I don't see much talk about this on the forums, so I apologize in advance if it has already been figured out elsewhere.

Is there maybe a better program to do this?

Should I give up on the idea of a flat world in general?

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