Ok a couple things to remember here:
I really have a hard time believing anyone got banned just for doing the sets. Odds are they got banned for directly transferring the coins to the main account.
You can trade players to your main, but then they can’t be sold from the main. You gotta keep them or QS them for training. They can only be sold from the farm if you trade it back.
You can and will get banned if you transfer coins.
I remember hearing that was a thing just did him on a farm and am gonna keep this NTL for my main is there a way to trade without raising a red flag is just trade him for an elite player? Any advice is greatly appreciated god bless