Welcome to W&SS John,
Edible plants is a fascinating area but also very complex and multi-faceted. Topic areas of interest to me are: identifcation, harvesting technologies, meal or bulk-scale processing methods, storage by primitive and modern means, medicinal uses, multiple uses (e.g. while processing edible parts of harvested plants, can other parts be used for cordage etc.) and of course cooking methods separated into primitive and modern.
I think the juxtaposition between modern and primitive across topic areas related to harvesting/processing/storage/cooking would be unique.
As for identification, many field guides are available but they often only show the plant during its edible stage. This is useful, particularly for books organized by season. It would seem that a newsletter approach would allow you to focus on a specific plant or small group of them. It would be very nice to show how edible plants can be identified at different times of the year so that people can mark stands of growth for future reference. E.g. can you forage for plants under the snow if you know they are found there?
I will look at your website!