You said earlier that your Therm build is 7.9PS. That was the range I was saying you probably won’t see many Caucasus builds.
I don’t think equalizers have enough range to stay far enough away from the Caucasus builds, which is why I am suggesting ACs.
But I notice you mention “needing” to play helicopters to clear your daily challenges. You do not need to. You can play a ground build in patrol and clear all the usual daily challenges. It just needs to be a battle that allows aircraft, and patrol counts.
The only ones that require you to play PVP with aircraft are some of the mini-BP challenges and some of the main BP challenges. Those are not hard to clear. I think you are making this into a much bigger deal than it needs to be. I don’t even think there were any aircraft challenges in this week’s batch of BP challenges.
You definitely do not need to be flying aircraft every day to clear your challenges. Did you buy both the current mini BP and the main BP? If so, just let the aircraft challenges pile up, and do them all at once.