I ended up writing a little embed widget to embed webmention responses/reactions into my blog posts. It all happens client-side, but so do Disqus comments so I figure that’s okay.
It only works with webmention.io as the webmention endpoint (although it could be modified to work with any endpoint that speaks the same query API), and I suspect Aaron might end up being a skosh annoyed with how I actually implemented it, but whatever. :)
Anyway, if you find any bugs with it or want to make improvements, for now you can submit an issue against the Publ website repository or you can just, like, comment here or something. Update, 7/9/2019 I have moved this into its own GitHub repository.