There's an app coming out (out already maybe?) for jailbroken iOS that maps bluetooth controller input to touch regions on the screen.
Basically it takes input from the controller and passes it as if someone had touched the appropriate control area.
Not sure if something similar is doable within the Android system.
Trying to find where I saw this recently, will provide a link to clarify as soon as I do.
Something like that would solve the issue in question.