Straight bars might fit or they might need a small riser so they fit.
The scrambler has dirt bike bars so there's tons of 7/8 bars and risers to pick from. There's also risers/adapters to go to 1 1/8 bars with no cross bar that still take the stock controls, some of those are very low and straight. The sky's the limit with handle bars that will fit this bike.
I have 7/8 dr650 bend bars on mine, they're about 2 inches lower than stock and fit without issue.
I had these bars already so I threw them on to try them and like them better than stock. They lean me ahead just a touch so the wind blast holds me in place, stock was too upright, it felt like the wind blast was pushing me back on the seat.