For anyone in a similar boat, I just heard of someone using Adobe Illustrator's 7-day trial to generate their BIMI logo file.

https://www.grc.com/sn/sn-996-notes.pdf (page 18) https://twit.tv/shows/security-now/episodes/996

Thanks, I'll give it a shot.

You could just hand-edit Inkscape's plain or optimized SVG file: https://bimigroup.org/creating-bimi-svg-logo-files/

(It's really not too difficult.)

That sort of thing makes me wonder if Inkscape shouldn't have a configurable "Post-processor" option like to that used for G-code, possibly on a per-file basis (add the editing commands needed after saving to a user-editable pane).

From what I understand of Inkscape's (somewhat dodgy) extensions protocol that shouldn't be too hard with a little xml processing magic.

--edit--

Looking at the linked page that would be super trivial to implement.

That site has links to tools at github.