One should be able to set the modifier `Highest` value lower then the `Lowest`, in fact this is probably the more common usecase (getting high values in the vertexgroup when something is close by and getting lower values the further away from the target we get). Now change code so we do exactly like we do for meshes. NOTE: for grease pencil (as opposed to meshes), the Vertex Weight Proximity modifier has a button to flip the output values, this can probably stay for convenience. Stumbled over this checking on #133055 Pull Request: https://projects.blender.org/blender/blender/pulls/133092