If Orks are my primary detachment, (My Warboss being my Warlord and such) can I take a detachment of Chaos Space Marines and a detachment of Elder, even though Elder and CSM are Apocalypse allies, but at the same time they can both ally with the Orks outside of an Apocalypse game? (CSM being Allies of Convenience and Elder being Desperate Allies?) Don't get me wrong I love my Green Tide but hey even Orks need a little help getting a Waaaaaagh! started.