most of the older folding bikes looks like they have a one piece stem/handlebar. am i wrong? or can you just unbolt the hex bolt and add on a new bar. because truthfully, i just want to have a badass vintage-folding-bike-esque folding bike with bullhorns that i can use to get around town.

i am hoping to not spend too much on the project.

$60 max on the bike
$25 on bullhorns
$50 on bringing it back to rideable/optimal condition.