On using webmentions solely for creating a sort of internal contextual web on the blog, I’ve basically got it working although it’s not turned on at the moment. The remaining problems include the fact that I can’t disable external webmentions if I want to; I’d be satisfied with some means of not having them sit in the “unapproved” queue other than deleting them. Also, at least as near as I can tell, the text of the reference link beneath a post is of a form that includes extraneous copy I don’t think I can get rid of. So, I’m still a ways from deploying this, but I’m at least on a track.