The /droprep command IS a reverse bribe, except that you do not have to do the log out/in routine. Failing missions by aborting them from the nav map does not affect any other reps beyond the one you aborted the mission for.
Dunno how you go about guard repping, but I do ~30 missions, then abort one mission for each full green faction, save the one I am tagged as, then abort missions for the faction to which I am tagged. With the new tool, I simplify the final step into a single command. Saves time, and the need to log in/out.