First of all, download this MPQ file.
In order for this method to work,
1. Go to the Orgrimmar Zeppelin tower
2. Board the Zeppelin to Grom'Gol Base camp.
3. Close WoW
4. Paste the MPQ File (Speech-2.mpq) into the DATA folder of your WoW folder.
This will change the coordinates of the zeppelin ride, since these are client-side files.
5. Start WoW again, log in with your character which you left on the zeppelin.
6. Now wait a while. You might not be able to move for a while, but don't worry, this will stop after a while.
7. Additionally, you might be stuck for a while in Dalaran, this is when the Zeppelin stops for boarding. Theoretically you will be in STV though.
8. After 5-8 Minutes (depends) you will zone in with the zeppelin to GM Island. Don't forget to jump off the zeppelin Very Happy
9. Explore GM Island Very Happy Very Happy Very Happy
But careful, you might get banned for that, so better use a trial account for that.