Hey there @xcritu! Welcome to the community! So Landscape manipulation at runtime is a hot topic these days, and the landscape edit layers system built into unreal isn’t meant to be worked with at runtime. This is usually why many of the solutions you find are incredibly technical. There’s only two ways down the path, either working extensively to make the landscape system editable (incredibly technical) or creating your own system of Voxels or Octrees or faking it with materials, etc.
Here’s a post from Joe Radak, a legend around here kind of explaining how much it would be to edit this at runtime:
If you were looking to maybe pick apart some other systems others have created or at least time some inspiration (or maybe a solution):
In my opinion since it’s top down you likely won’t need extreme fidelity, so going with voxel plugin if you want highly variable landscapes, or just modifying the world offset in a material on a tiled static mesh setup could also work.