Using CombineMesh with point topology?

I have two simple meshes which are using points topology and I am trying to combine them using Mesh.CombineMeshes. However, CombineMeshes seems to always triangulate my meshes and set the mesh to use Triangle topology. I want to keep the points. How can I combine meshes while preserving their topology? Am I really going to have to combine the meshes manually (much slower) or use Triangle topology?