FA beyond 225 requires level 35, so no. Also, in order to loot, you need to be able to do more damage than the guards. While I downed the rare, and got the achieve, I did not get to loot. I also made use of LoS. He was trying to fear spam me. I judged, LoS, rinse and repeat. Of course the guards then smashed him, and I kinda laughed as I got the achieve, then was a little disapointed I didn't get to loot.
As for farming Nagrand rep, definitely possible to solo, although incredibly time consuming. If you can, I suggest you get help from a higher level.
You have to remember that the upgrade from vanilla isn't just outlands, it's also the BE and drae zones, with numerous things we can use. It's all BC content.