It's been around... looks at clock ...nine years since something significant happened with the EB Garamond initials, but a couple of months ago they split off into their own github repo and you can now use all the letters of the alphabet! Before, it was limited to a subset of letters.

NB, this only applies to the original Duffner EB Garamond, not the Octavio Pardo version found on Google Fonts.

If you want them, clone or download the repo, download the dependencies, and run make. Or message me and I'll send the files. It's free software so that ought to be ok.