All predicated on the idea that third-partying is a bad thing. Or a thing that you can mitigate in a multi-team game. It isn't. And you can't.
So here's your real third-party solution. Stop getting yourself into situations where third-partying is likely. I'm not saying that you can play in such a way as to guarantee that it never happens to you again, but I'm living proof that you can play in a way where it happens once or twice a season, not once or twice a match. All it takes is a little game sense and to stop thinking that you're entitled to any engagement at any time in any congested or center-of-map area without having to worry there's another squad close at hand. It's battle royale. There is ALWAYS another squad close at hand no matter how quiet you make your guns. Just ask yourself how many scan legends there are in this game now, and how many survey beacons on every map. Nobody needs to hear your gunfire anymore. They KNOW where you are.