I've been using unbound to play harlequins for a while now. And by unbound, I mostly mean buying raiders and venoms for my harlequins. I haven't tried the new codex yet, but I suspect I'll still play unbound just to get raiders. Of course, archon as great harlequin and a couple squads of raiders would be easy enough to make it a real detachment. But then I'd need to get around to buying raiders.
My area nobody cares as long as you aren't being an *******. And there are plenty of ways to be an ******* and still be bound.