Need help figuring out Chromebook Powerbutton shortcut for Hibernation USB

I'm trying to use a nano to hibernate chrome books for long term storage to avoid having to do the dual key press but I can't find any documentation on what the ascii table is for the chromebook power button or refresh button. Does anyone out there have any experience with this or know where to look?

Thank you in advance, I have about 1000 of these things to hibernate

There is no keyboard code associated with a power button on a normal computer (ie, you cant simulate a press on it from an external keyboard or arduino pretending to be a keyboard), I am virtually certain the same is the case for a chromebook.

But a nano cant simulate keypresses anyway because it doesnt have nativeusb.

What about configuring them to hibernate after a period of time of no activity, then awaken on activity -- "activity" being either a keypress, or network wake-up, something like that.

Sorry if that's a ludicrous suggestion, but given the lack of information, can you blame me [x-y problem, perhaps]?