Config::Model provides another GUI to help with Debian packaging.
Contrary to the other tools you mentioned, Config::Model does not try to build the package. It provides help and guidance to edit the various debian files required for packaging (i.e. control, copyright and some other files). It really helps keeping up-to-date a lot of details that are easily forgotten.
config-edit is provided in Debian package libconfig-model-perl. Once this package is installed, just run 'config-edit -appli dpkg' in your package directory.