Flash to the unlocked rom. Not only will it remove AT&T bloatware, you'll get the beta. It will not break your phone or void your warranty. Flash the unlocked sm-n97xui ROM with Odin. Back your stuff up cause it'll wipe your phone. Trust me. I have an AT&T phone and I have the beta
I have been Flashing all 5 Betas as they come out after I find site to download them. I disable or uninstall a lot of the ATT Bloatware but like the Advanced messaging that U1 does not have. ATT has too much control over a Samsung phone's Firmware. Other carriers are much better. You cannot hardly find ATT firmware for a phone if you need to flash it they protect it so much but not with T-Mobile and other carriers. But ATT has best coverage in my area so have to put up with them.