These both sound very exciting!
Linguistics Vanguard does publish lingcomm stuff - I know this because they have a track record of doing so, but also because when I signed up as an Area Editor they let me put lingcomm as one of the areas that I manage. The advantage of LV is that papers are around 3000 words but are required to show some kind of advancement rather than just being descriptive.
Putting together the LingComm bibliography made me see clearly how Language and Linguistics Compass has a long history of publishing excellent lingcomm work:
https://docs.google.com/document/d/1O6884ZP0lw5gt7eRgNBosxCKEkH-lIKNA2lYPJ1_Zew/edit?usp=sharing
As you mentioned, they do operate on a slightly odd "invitation" model, but you can always pitch your idea to the lead editor for Education & Pedagogy (current Ashley Farris-Trimble) and see how things go. Really good for State of Things papers, like your attitudes to language sciences paper.
The new journal Innovations in Linguistics Education does not say explicitly, but they’re open to discussions of linguistics education in all contexts, including lingcomm contexts:
https://journals.ed.ac.uk/innovationsOutside of linguistics, the journal that most aligns with our work is the Journal of Science Communication (JCOM) - also great because it's a diamond Open Access journal (no cost to publish or read)
https://jcom.sissa.it/They run a whole series called "Practice insights” about specific projects and their success, which are under 5000 words. I know with some SciComm journals there can be a challenge in convincing them that linguistics is a topic of scicomm, so might require some careful framing.
Looking forward to hearing other suggestions! If your local areal/national journals also publish lingcomm that can be useful for people to know! (and, of course, if you have other work to add to the lingcomm bibliography, please use the linked form to let us know!
Cheers,
Lauren