Nope, the TV station that ran the ad would not be an "accessory." To the contrary, as I've noted in other posts on this thread, as long as a federal candidate is in the equation the station MUST carry the ad and cannot censor it.
I made that comment before getting to your scheme. However it seems to me that the scheme doesn't address the issue, that being that a group can't run such ads in the proscribed time frames. If it's the candidate's ad, with a bunch of other folks names on it, that's not the same thing, and even winning a case based on such an ad might cause a small change in the way the law is enforced, but nothing more.
But the other step is also essential. Create a new group, say "Citizens for Free Speech about Politicians." Incorporate that group, so there is zero question that the CFR law would forbid THAT group from broadcasting an ad about its political opinions. (The candidate would be a willing, deliberate part of that group.)
With both conditions met, run the ad and dare the authorities to come after all 1,000 people. Odds are, they would come after the candidate only. Heck, that's like going on point. Somebody's got to do it, or the unit doesn't go anywhere or accomplish anything.
Does that answer your question?
Congressman Billybob