Indeed exciting. Problems I’ve had with the lmic library and the teensy (which doesn’t maintain a clock whilst it’s sleeping) is that it would wakeup on a timer, then wait 13 minutes, send a packet and go to sleep again. However, the 13 minute wait only happened if the sleep (Which was a for loop of sleeps of 50s) was in total for just one hour. The other nodes which did the for loop for 8 hours didn’t have the problem. Nor was there (that I detected) a problem when the node woke up from a gpio, but is likely that I simply didn’t detect a problem.
In any case, I’m hoping that all that will go away as well as requiring one less battery when I can start to use your nodes 
Kim