A PNP transistor with emitter to 3.3volt and base with a basecurrent limiting resistor to a pin and LED/resistor between collector and ground will probably work for a 3.3volt processor (Due). Calculate max pin current, max port current, and max chip current before you pick a base resistor value.
But... there is not enough headroom for a blue/white/high-efficient/power LED (with a Vf of ~3.3volt).
Just enough for a common 3mm/5mm red/green indicator LED (Vf ~2volt).
And... there is a current limit for the linear 3.3volt regulator (the 30 LEDs).
Leo..