For future readers, I was able to get snooze working with the FLASHMEM edit to hal.c, as described in the threads above. But, this was with Arduino 1.8.19 and TD 1.57.
I was not able to get it working with Adruino 2.2.1 and Teensy 1.58.1...
Greetings!
I have a project that would benefit from the multiple connectivity options (particularly UART) of the T3.6 or 4.0 or 4.1. I have about a dozen Teensy 3.6's, but if I need any kind of production, obviously, I'd prefer to migrate this...