Easiest place to start (although purists will shudder) is to get a shorter stem, a riser stem, maybe a steerer tube extender and a really short & stubby DH/BMX stem. A combo of those parts might put the bar where your back can stand it. Adding a pair of CX/interrupter brake levers is no big deal.

If you aren't comfortable with a drop bar I don't think it's advisable for you to get flat bar cut down courier-style either. Even if it gets within a reach you can manage it still takes a certain amount of skill/experience to ride a narrow bar bike safely.