Do your readers even notice your example?

I don't know. I know they often praise my articles for being well-cited, but I don't know if they would say the same thing were every citation a mere link to Pubmed.

My question is how to get people to link to public versions, not how to get them to jailbreak. I think that when I offer them a public link it is a good opportunity to shame them. If I call it an "ungated" link, that makes it sound abnormal, a nice extra, but not the default

If you just want to shame them, then there's much more comprehensible choice of terms. For example, 'useful' or 'usable'. "Here is a usable copy" - implying their default was useless.