While waiting to get things manufactured, and on/off working on the alarms, I also looked into a color LCD.

At 1Hz refresh rate, and 1Ah battery, assuming no other power draw, this is a 5uA display, which corresponds to about 22 year life. I see many problems here, most notably the need for well regulated 3.2 and 5.0 V dual power source, but that's for future consideration. Not bad, and definitely worth the next iteration if anyone would like to explore a color variant.