Could it be possible to add the velocity channel from the SDF to a exported VDB mesh to achieve motion blur??
Currently the available option is to transfer your velocity to the UVW VDB grid and then render with a Vertex Color map or something to do blur in post.
Or you can use a tyMesher in blobmesh mode, which now supports motion blur.
In the future I would like to extend tyFlow VDBs to have better native moblur support.