gnu.org-hosted external repositories for GNU ELPA packages?

[Phil Sainty]

I've written some libraries that I'd like to propose as additions
to GNU ELPA (or otherwise contribute to GNU Emacs).

https://www.emacswiki.org/emacs/DelightedModes
https://www.emacswiki.org/emacs/SoLong
https://www.emacswiki.org/emacs/SqlUpcase

(and other projects which are in rather less-functional states.)

My preference would be to maintain them as external git repositories
so that I can push work-in-progress without bothering the emacs-devel
list, and only notify emacs-devel once I was happy for a new version
to be looked at.

I would prefer not to have to use some other git host, however.
It would be nice if the upstream repositories were hosted at gnu.org.

http://git.savannah.gnu.org/cgit/emacs/elpa.git/plain/README does
discuss submodules and external repositories, but doesn't make any
suggestion with respect to a gnu.org hosted solution. It would be
helpful if this scenario was covered.

Is the sensible thing to register the projects at
https://savannah.gnu.org/register/ ?

I can see a couple of relevant examples in the externals listing:

 ("auctex" :external "git://git.sv.gnu.org/auctex.git")
 ("enwc" :subtree "bzr::bzr://bzr.savannah.nongnu.org/enwc/trunk")


thanks,
-Phil