"Two self-styled vigilantes against typos"

Mom-a-thon and I have seriously thought about doing something like this:

Two self-styled vigilantes against typos who defaced a more than 60-year-old, hand-painted sign at Grand Canyon National Park were sentenced to probation and banned from national parks for a year. They had removed an extraneous apostrophe and added a comma to the sign.

Our first target would be the giant KFC banners around here that advertise BARRELLS [sic] of chicken.