I can’t sew for nothing. Just the way it is. But give me some gorilla tape and man, I can put junk together. Ends up kinda heavy in a BPL context, but it works! Of course, I usually find someone to make me what I’m after when I’m done prototyping with gorilla tape and such. But I haven’t reached that point yet.
Anyway, I attached my trekking poles to the back of my Helinox Ground chair, then cut up some tyvek I had laying around, slathered it with some gorilla tape, and came up with a very workable headrest for the Ground chair. (I’d have a pic with me sitting in it, but I live alone, and I didn’t feel like getting out the tripod, and Siri was simply not cooperating).

The hiking shoe is there because with this thing on it’s a tad (or is it a scooch? I always get those two confused) back heavy and will fall over backwards (kinda like me after a couple of scotches….) without it.
Anyway, I used two pieces of that sticky stuff, what the hell is it called (getting old really sucks) …. VELCRO! Yes, velcro (I really couldn’t think of the word, took me a minute) on each side to attach the poles to the chair. Holds quite well.

A couple of things I’ve found out so far: attach the velcro where it can’t slide up (lower piece) or down (upper piece). It’ll slide if you let it. It’s just that way. Also, don’t cut the headrest square, it needs to be more of a (whatever those things are called where the top length is longer than the bottom length). And before you measure for your headrest, sit in the chair with the poles attached and have someone else measure, as the poles come together a bit when you sit in the chair. Lastly, you want the headrest to be something that doesn’t stretch, and that’s narrow enough to put slight pressure on the poles inward (there’s a better way to describe that too. Where the heck is David Thomas when I need him) when you slip it on, you want the headrest to stay somewhat taut.
Okay, I’m off to see if I can use a bit less tape. If you can sew and have cuben, I bet you can get this thing done for a couple of ounces. Worth it for a headrest, methinks.