You can write a paper, submit the arxiv, and you can also make a blog post. At any rate, I agree - SO was (is?) a wonderful place for this kind of thing.

I once had a professor mention that they knew me from SO because I posted a few underhanded tricks to prevent an EKF from "going singular" in production. That kind of community is going to be hard to replace, but SO isnt going anywhere, you can still ask a question and answer your own question for permanent, searchable archive.