I hadn't considered it but he got me thinking.
I wondered about the best way to do it and came up with creating a shortcode that can be entered on any post or page, and also in a template with the
An initial version is in place on my site and seems to be working fine. It relies on the indieweb Semantic Linkbacks plugin being installed and domain exclusions can only be added by modifying the plugin code - for now.
I will look to add a settings page for the easy addition of exclusions. For example, I have my own domain and micro.blog currently excluded from the list.
As always, you can find it on GitHub.