The Roll comes with a BMX-style handlebar that could easily be swapped for a different style to suit fit or comfort. Of course, it being a quill stem allows you to make height adjustments without buying a different stem, so there probably is a range of adjustability that's baked-in to the design.
A Raleigh wouldn't be the worst bike in the world, either. Our daughter rides a 2015 Raleigh Alysa 1 and I've been rather impressed with the fit and finish on that bike. The frame in particular seems to be constructed very well. All weld beads are even and consistent, graphics on the bike are silk-screened or painted rather than stuck-on, and the luster of the paint and clear coat is quite good. Her's is the "1" (base model), so it has Revoshift shifters and Tourney derailleurs with a freewheel. Still, it rolls smooth, pedals smooth, and does everything a bike should do for a 12 year old kid.
I'd buy another Raleigh without hesitation. Consider something like a Redux 2. It comes with a rigid fork, disc brakes, 1x9 drivetrain (with Alivio Shadow derailleur), and is less than 500 bucks on their website. It might be just what you're looking for.