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Would cutting them off be considered an even worse alteration?
I believe that the stamp should be left as is. It would serve as a useful instructional tool. I used a few images of bonehead modifications in the Expertizing class at the APS Summer Seminar in 2014. Bill Weiss, Irv Miller and I will be reprising the class at the 2015 APS Summer Seminar.
Cutting off the fake perforations would remove the center line and nullify the value of the stamp for plating. Also, the cut would be no more authentic than the original with the fake perforations.
Clark