Ah, sorry I missed your primary goal. Would it be enough just to remove the "flags" off the stems? Wouldn't the tuner posts still be in the way? Even if you shorten the posts as well as remove the "flags" wouldn't they have to descend a bit from the peg box? If not, doesn't seem too expensive a job to have a machinist square off the ends of the posts so some sort of drum key-like key would fit. Worst case, time for a set of tuners!