@jeremycherfas I've set up a ClassicPress site and the Indieweb plugins all worked. I detailed it here: cyberzettel.com/successfu...

The major hitch was from my host which runs an auto-update robot for all Wordpress installs, for security purposes, which kept reverting my ClassicPress site back to Wordpress every half hour. I had to get them to turn that off for my ClassicPress install.