"Any plans for a cinch or wrist strap of some kind?"
I can't claim that there are plans. However, I've given it plenty of thought. The main problem is that I don't know how long I want them to end up. Plus, I don't know whether I want them to hang outside my sleeve cuffs or tuck inside. Outside or inside is dependent on whether I am using ski poles or trekking poles, because melting snow tends to run downhill.
Basically, I don't use gloves or mitts much for summer backpacking. OTOH, my hands have been pretty cold on those sub-freezing mornings. So, as they stand now, I can fit in my hands with some thin cotton inspector's gloves on. The cotton gloves weigh almost 0.4 ounce per pair.
If I use them for winter, I will need to sew up another pair slightly larger so that I can fit in some wool liners.
The bad news is that my sewing machine really doesn't like material this thin.
–B.G.–