Can a bluetooth keyboard/mouse be supported for android mobile, I looked it up and got no results, so, is this a thing that is supported?
I’m looking for it too
I think connecting bluetooth keyboard/mouse to an Android device is done through pairing normally, not necessarily through Unreal. Then you could still have the input programming for PC in your Android build and test it. So, I suggest: Pair a bluetooth keyboard with your Android device first, then test your device with your app containing your input for Keyboard/Mouse.
My guess is you will have to do some extra steps to visualize the mouse, while the keyboard should work readily.