I'm pretty sure unbanning requires kernel access, and 10.7 really only has software that can downgrade the system to 9.2. (Or homebrew/games/tools that don't access the kernel)
If you're worried about bricking: You can't really perma-brick unless you don't follow directions carefully. If you brick, it's almost guaranteed to be a softbrick, which you'd just enter recovery menu to update to the latest version (which is still 10.7)
If you want to update: Keep sysnand on 9.2 and continue to update through emunand.
EDIT: Oh whoops, I forgot you can't really hack 10.7 unless you have OoT, Cubic Ninja, or Sm4sh.
The first two require a way to edit the save file, either through an external tool like PowerSaves or an already-hacked 3DS. The latter requires Linux.