@chrisaldrich@realkimhansen Maybe webmention a hub site? I think there's something to be said for setting up central topic-specific hubs.
I am super interested in topic-specific hubs. That's the main goal of a new project I have brewing! My first attempt at this is https://news.indieweb.org but I want to make it easier to submit things as well as easier to create new hubs!
If your webmention sender looks at the rendered HTML to find links, then you won't have to add anything special for this syntax! That's how I handle it on my site, since some of my posts are plaintext source and I don't want to match @-names and URLs in totally separate code paths.