Hip Hop Skid Bikes / Hipster Sleds / HHSB

do what I did, cut the steerer above the headset, use a threaded to a-head converter that is 1 inch
deda makes them, cover the transition section with spacers, clamp the top with bars
easy

oh ok, hadn't though you chose that route. That means though that your forks become designated to those bars. Want to continue using 1 1/8" stem afterwards? either got to use a shim over the a-head converter or change forks.