Benjamin Kenobi
Easy? You call that easy?
Huh? Servo and X1/X2? Aren't X1 and X2 something on the NAZA? You're not plugging the receiver into the naza for tilt control, just a spare channel (you mentioned channel 5) straight into the tilt slot on the Zenmuse GCU. Then assign a switch to channel 5 (or a knob would be better), adjust end-points to slow it down a bit and you're away.