Will this work?

If i have my key which is banned then create a new steam account, buy arma 2 OA on there and then use a key changer to change my banned one to the clean new one Will i get banned or anything?

And also when battleye ban you what do they ban like your IP?

If you dont hack on your new key then no you wont get banned, and i'm pretty sure battleye isn't aloud to IP ban you. So you wont get banned if you dont hack