The escape from the deathtrap is ludicrous even for this series. In order to make the punches hit around their bodies, Batman and Robin would have to hit notes above the treble clef (which only sopranos can reach) and below the bass clef (which Batman might be able to hit, but Robin certainly can't).
Chantell's plan would work if Bruce Wayne willed everything to Dick. Then, whether Dick willed everything to his aunt or died intestate, Aunt Harriet would get everything. The problem would be discovering whether Bruce or Dick died first.