Did they change it so you can enter battlegrounds at goblin starter zones? if not, i just found a way. dont know if this is for any help.
Edit:
Actually i dont think this is intended, as the phase im in at the lost isles is really buggy. there are invisible mountains i can walk on, the water is buggy, and only a few npcs. And when i left the Battleground i eventually got teleported back to timeless isle, but my hearthstone location got changed to valley of strenght.