Interesting about the Apple Watch. When I fell and broke my wrist a few years ago, my family insisted that I get some kind of "emergency alert" system. After discovering that most emergency alerts cost around $30 or so monthly (and can only be rented -- so that's like paying forever), I figured it would cost a lot less to just buy an Apple Watch for a few hundred that I could use in case of emergency. It can sense any "thumps" or "hard knocks" which prompts the watch to ask me if I've had a fall, so I feel pretty safe with it. I like being able to make and answer calls on it if my phone isn't with me, and to see the weather at a glance, too. Seeing my BG on my watch would be super-convenient.
By the way, since your Dexcom only lasts 10 days, does your doctor write the prescription for 3 sensors per month? And refills for one year?