How about a wearable poster board print out with a giant red NO stamped on it in faux blood as your costume. You can stay at home or walk the neighborhood, handing out full sized bars.

Want to be a real extra contrarian? Build a "candy stand" made of the print out. Add castor wheels and a loud speaker and flashing lights. Finally, add a button kids can slap that shouts "fffuuullll sssiiizzeedd bbbbbaaarrrrrsssss!!! at max legal volume. Roll it from HOA leader house to HOA leader house as the night carries on.