Looks good, although I’ve only skimmed the document so far.
One thought, more for discussion than as a specific suggestion - would it be possible to give some idea of priorities for the various suggestions? Speaking as a package maintainer, not all of these seem like they would be something I’d necessarily find easy, and having an idea which to focus on would be helpful. It would also emphasise that this isn’t an “all or nothing” proposition, and anything that upstream maintainers can do to help is useful, even if it’s only a small part of the job.