Hello, per the other interest check, I was exploring the possibility of a member of the Deathwatch from one of the chapters not traditionally associated with the Inquisition or the Deathwatch, with the attendant political baggage. I was reading up a bit and Ordo Xenos inquisitors from the more radical factions apparently favor arrangements with these chapters; in essence, the Inquisitor is covering their back with a Space Marine and the Space Marines are covering their backs with political favors from an Inquisitor. 

I have a lot of chapters in mind, all of them non-traditional and with baggage and secrets, as I think that the chapter's political machinations, insofar as they exist, need to be tossed in the pot here.