I don't think you need to mount any kind of boycott campaign. Things will take care of themselves. If the Republicans, with the kind of majority that they have now, cannot put conservative judges in place, for whatever reason, they won't get the turnout they need at the polls in subsequent elections. It's just a fact of life. I know I won't be voting. I can't support the Democrats because they are destroying the country. And if I see liberal, or so-called "centrist", judges being appointed now, I won't be able to support Republicans either, because they would then be willing accomplices of the Democrats. So it will just kind of take care of itself.
It doesn't hurt for them to hear it.