I've had something similar for a while i made with brahma and archshift's i2c.
This is good though And probably safer (apparently the i2c stuff can be possibly dangerous, I've never had any issues though).
So would this work with Gateway (+ NTR)? I use NTR Debugger a lot, but it's kind of annoying how, when the Debugger is enabled, the only way to turn the 3DS off is to push and hold the power button.
Here you go! Hope you like it.