I have a script that exports a path as a CSV, so you just have to make a path that goes through all the points you need, then export the path. The CSV likely contains some info you don't need, but it's easier to deleted that than to add it when missing.
http://gimp-path-tools.sourceforge.net/t...l#path-csv
http://gimp-path-tools.sourceforge.net/t...l#path-csv