I'm sort of experimenting with a Warm and Safe heated shirt and a pair of Gerbing gloves I got recently. I really like the versatility of layers for riding out west when it can get pretty cold at night but pleasant during the day. Heated gear also prevents me from feeling like Randy in A Christmas Story, and holy cow was it nice leaving Barstow a couple of days after Thanksgiving with the bike indicating 31*.
I think my takeaway here is that if the shirt dies, do I have a wool or synth layer to help make up for it enough that I can keep going? I will try to from now on.
Just as an aside, I whipped up a quick-release mount for my last trip using an action-cam mount and some velcro and scrap I had in the garage. Super-easy to see if the gear was on and at what setting, and maybe five seconds to detach at lunch.