Haha, gotta say, for non-system reasons I don't like this one. Namely, because 'UAV' and 'Drone' is such a broad term that only implies something scary and military because the military was the first group to actively use it. Refering to unmanned attack drones is about equivelent to refering to 'tanks' as 'motor vehicles.'
That said, I wouldn't stat up UAVs as characters - that implies that they're somehow mortal and can make decisions for themselves. I'd think of them more like cars or planes. The're capable of a weapon: 4 attack, and maybe it takes 6 or 8 shifts of damage to take one down. Or a tiny bit of hexing, which is why I don't think they're a very good foe in this setting.