Long time since I've had 26" wheels, but the Halo White Line Classic is my go to in 700c for rim brake touring and I'm a good bit heavier than you. The 26" size is I think around 500g, available silver, black/silver and black/black, the latter has a black brake track but is still sold as a rim brake rim, not sure how that works.
I broke two flanges in ten years, then none in the fifteen years since, one of my hubs is without rings, the others have had rings from new. I suspect either the hubs or the wheel-building have improved, though it may just be luck. I doubt you'll notice the weight of the rings on the hub, it's not like weight on the rim. They might get you out of trouble one day, or you might never need them. Thorn's ex workshop manager advised not to fit them unless rebuilding the wheel anyway, but to do so if/when I was.