The cleat is only half of the reason to wear cycling shoes... the soles are a lot stiffer than normal shoes which prevents your foot from bending around the pedal and will stand up to repeated stress in every direction (up, down, forward, backward). For that matter, I think just the torquing stress alone from clipping in/out of SPD pedals would destroy a normal sneaker sole pretty ****ing quick. On top of that, converse all-star's have some of the floppiest, bendiest, twistiest soles around as far as sneakers are concerned (and no arch support either). Not trying to hate on your ingenuity here, but I'm guessing that before long you're going to have some perfectly walkable converse all-stars with big ****ing holes in the sole. OP, might wanna keep this in mind before you go carving up your new Pumas

Now, with that said, I have always wanted to bolt some cleats to the bottom of a pair of wingtips. Who knows, I still may...