General :: Samsung Galaxy Tab 10.1 WiFi - Override Sensor

I have a project where I want to create my own custom sensor to be used with my Android device. Im hoping on using a Samsung Galaxy Tab 10.1 Wifi but I can get hold of basically any available tablet if that makes solving the problem easier. The solution is just for me so it can be heavy modifications to the Android OS if needed (preferable not though...)

The custom sensor is going to be connected with the device using bluetooth. I have currently a setup with my sensor connecting nicely and sending the values into my custom Android app but it is just my app and not any app on the device. I want to take it to the next level by basically overriding some of the built in sensors with my values to enable me to play any game that is meant to be controlled by the accelerometer my custom sensor.

How to change on a system level the constant variable SENSOR_TYPE to a public variable which I then can either override or change permanently to point to my sensor function instead. As I understand this it would need a fully custom ROM. So when any game call for example

mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELE ROMETER);

Sensor.TYPE_ACCELEROMETER would point to my custom function instead.

But as I said this would need a custom ROM which sounds a bit large task...