Damn it, that would mean missing content, and I hate doing that.
Well, you have to choose Between missing content and letting him in, with the risk of him spying at least at first. Even if you tell him ' join me and don't Spy on me' you won't be sure he won't Spy anyway.
Though it's possible that he won't Spy the inquisition by default.
Yes, and we know what attitude the qunari have to bas who are also bros: kill them anyway but make a speech about how you respect them first.
Or They get killed. Though that's only in the case of an actual War. The comics shown you can form alliances with them (if you're good enough to beat them).