I wouldn't call that a poor man's fixed cup tool because you already have the tool otherwise- I'd call it the "square shank" of fixed cup tools-

which sounds even more obscene
and which compares it to a screwdriver with a square shank to fit a wrench on for "extra stuck"

a poor man's fixed cup tool has always been a 12 inch crescent wrench

unless the man is mentally poor, and then it may be some vice grips and a hammer.