I'm looking for something to let me ignore the invitation to join the Circle and continue doing Companions radiant quests. I found one on the nexus, but the author has blocked it for some reason.

Yeah, this really needs to be done - same as with the college of winterhold. Doing radiant quests to improve your standing in the guild will really improve the overall experience and make the whole questline more plausible.

I started playing around with this myself for the college, but am still getting to grips with scripting and didn't want to do anything that would mess up the vanilla quests - hope someone else can take this up!