Switching from a “blog” subdomain to “www” has caused Blogger to lose all previous comments. I don’t know if I should be upset about it. There were good ones that offered useful information long after I’d posted on a subject, but there doesn’t seem to be anything I can do about it except switch back.
In the meantime, I’ve sorted out a format for outbound links. Their post titles are preceded by an arrow symbol (➟) and clicking on one brings you straight to the relevant page.