If your stem isn't one with a detachable face-plate then you might need a new stem too. If you just want brake levers on the straight portion of the bar (near the stem) you could use 'interruper/cyclo-cross brake levers.

You'd need a drop-bar, brake levers/brifters or Ergo shifters/brake levers or bar-end shifters. If you want a mtb wide tire bike with drop-bar I think you'd be better off buying a used mtb and then getting the parts you'd need to convert it to a drop-bar bike. At least until the bar fails at that hole. A bolt through all three pieces holds everything together. Origin-8 Intersekt 7, 7 speed stock grey frame, Pink Handles, Tires and Bottle cage. Additionally, users can swap color schemes of titles, texts, and backgrounds with over seven different coloring options. I have seen drop-bar bicycles with twist-grip shifters on them near the stem but i call those 'DEATH BARS!' because the bar is in three pieces, a left section, a reinforcing sleeve and a right section that sdlides throught the reinforcing sleeve and into the left portion of the bar. Silver, gray or bare metal 2015 Origin8 Intersekt 7, serial: unknown. The shifter will be a bit awkward to use as you'll have to move your hand over the larger part if the shifter is further back than at the curve of the bar. Im interested in getting a bike for rides around the neighborhood and occasional commuting. The shifters will be on the lowest portion of the bar and will be no further on the bar than the start of the first bend.

Those will allow you to use both the brake lever (if it's hinged to go on otherwise it might not go past a bend on the bar) and the twist-grip shifter. If you go to a bicyle co-op or a big bicycle shop you might be able to get a used STEEL drop-handlebar.

Origin 8 intersekt 7