Rules always change. What about the people who bought a Spyglass, and then Lane Hacker Guard ID didn't allow it anymore? They had to sell it. Rogue ID and Scylla. Junkers pirating in house space. BHG Core ID, even when the Tech chart came into use, if you had something unapproved, you had to get it writen, or sell the stuff.
Rules change, and when they do, it affects everything in use at the moment, everyone accepted it in the past (with complaints of course). It's the way it is, do you want to change the deal? Talk with the reavers, are they being jerks? Weren't they always seeking money? Re-hire them, and problem is solved.
EDIT: I do think that unlimited number of guns/ships shouldn't be allowed to groups that shoot you, but that should be done while they still worked for sairs. (Don't yell me Jameson)