How can I use one Android device as mouse and keyboard input for another Android device via bluetooth? I've already seen lots of ways to do this for Windows PCs, but is there a way I can do the same thing but for another Android device?
Android Mouse and Keyboard might be able to do what you want. Install it on one device, use it in bluetooth mode, and then sync that device's virtual bluetooth keyboard and mouse to the other device just as you would a real bluetooth keyboard or mouse.