All things - Low Power

I am building a teensy LC based 433MHz remote and hoping to implement low-power modes to maximize its battery life. I've got a bunch of push buttons, an encoder, a numpad array, and a joystick for user input.

1) first, is Snooze library still the best path to travel?
2) if so, can someone point me to example code that basically "wakes" anytime any of the above UI is interacted with and then goes back to sleep?
3) is there a known reason why teensyLC pin 12 won't "wake" I've tested 2 separate boards to confirm its not a hardware issue using the button_hold_wakeup example sketch.

So far I have gotten the button_hold_wakeup example to work (on INT pins other than 12), but am having a lot of trouble getting my own simple proof of concept sketch to work. Any examples and or words of guidance would be appreciated!
 
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