The Fallen Leaf [Pandaren-RP] 🍂 The Fallen Leaf: Hiatus - #62 by Chíeun-argent-dawn is the only ‘neutral’ Pandaren guild I know of on AD. Not really neutral since it is very pro-Pandaria!
Other races are permitted in, but the guild’s themes and cause are very much aligned with Pandaria.
Unfortunately, due to changing circumstances I was no longer able to lead that guild, so the concept’s been put on hold.