I’m sure there are other options on Alliance side, but if you’re interested in rolling Horde, Flashbang Exports might be worth checking out. I am an Australian GM, and I would say roughly 30% of the guild is Oceanic. The guild itself is medium RP, medium PvE. In others words, RP isn’t all we do, but we do run two RP events a week that are suited to both US and Oceanic players (generally Fri/Sat server time).
Two of our Supervisors run some guild events (battlegrounds and pet battles) around 5am server time during the week. It’s usually a small turn out, but we could always use more players to liven things up.
It is a goblin-only guild (which suits our relaxed, easy-going playstyle), so that will be something you’ll need to consider as well.
Best of luck in your search!