You do not need access to the power settings to be able to boot into APX Mode. If I remember correctly you do the following:
- Press and Hold Power Button
- Press and Hold RESET Button (Using paperclip or pin) for 3 seconds
- Release RESET Button
- Release Power Button
It will appear that the tablet doesn't boot, but if you then plug it in to you PC with a usb cord to the miniUSB port it should recognize it as an APX Device in the Device Manager. This should let you do the BlackThund3r's recovery method, or any other method using APX.