I have some complex meshes imported from photogrammetry which I am trying to clean up in Blender. One of the artefacts that sometimes arises is when two parts of the mesh incorrectly join to each other creating a handle point. I need to remove these so the meshes have genus 0.
This is one example. I want to remove the highlighted "pillar" so that the upper and lower parts in view here stay separate from each other.
I have been able to bodge together a method in edit mode using knife cuts, deleting faces, and then filling holes using grid fill, but it is quite laborious and the resulting geometry does not match the surroundings well. As far as I'm aware there aren't any tools in sculpting mode that will change the fundamental topology in this way. Any suggestions for how to do this without too much micro-management of individual vertices, and leaving a natural-looking result?