My team has developed an add-on for Blender that loads centerlines generated by VMTK into Blender, and writes meshes from Blender so that they can be easily read by VMTK. The add-on has now been updated for the stable long-term support version of Blender (2.83), and I wanted to provide a link to the new software.
Documentation and code is available here:
The add-on includes a simple mesh-cleaning routine that helps the VMTK tool function better on Blender meshes. There are also a couple tools that perform useful functions using the centerlines in Blender, including generating cross-sectional surfaces, projecting objects (for example vesicle spheres) onto the centerline, and detecting swellings (for example boutons) in the mesh.
The old link to instructions in my original announcement from a couple years ago no longer works, would somebody be able to update it?