I don't know if the transition would be too difficult, because I have never seen a Rockchip 3288 SDK. I know the main differences are in kernel because now they use a proper 3.10.0 kernel version with device tree, and another partition called resource.img. But apart from that, Rockchip is quite conservative and pretty close to "Nexus AOSP", so I don't think that development for RK3288 is difficult.