Our company has tremendous experience customizing and developing Android. We can point out many reference devices we have worked with, some of them being completely built by us. Android Linux kernel, userspace libraries, HALs, JNIs, Java frameworks and Java applications are something we have worked with a lot. Although Qualcomm chipsets are the most familiar to us, they're definitely not the only ones. Kernel display drivers, USB drivers, audio drivers - sensor HAL, audio HAL, DSP sensors and much more may be addressed off the top of our heads. Android apps performing Bluetooth Low Energy functionalities may be built fast and properly. In short, customizing Android is our regular business. Believe it or not, but we have worked with the largest Android manufacturers in the world.
Stop by us for a chat and we'll provide more detailed information of our capabilities related to Android. Even if you think your idea is not possible to implement, we can express our opinion on the matter.