I don't know if it'll work with BOTW but it worked for xeboblade x (NTSC->PAL). Create a new game in NTSC version then make a save bakup using savemii, paste the loadliine saves into the backup folder (delete the old files) then restore the backup in savemii.
Her repacks are heavily compressed thats why it's only 4GB, if the torrent is from trusted site you're safe. The problem is that it installs very slow because of decompressing.
I checked just now and I'm not banned (boot9strap+Luma). I had turned on every sending info option available and the only thing i didn't use were game hacks, save editing and mii plaza.