It's quite reasonable to hire a porter to carry your pack, while you tool along with a daypack or less.
So, within reason, you don't need to be that careful about weight on a Nepal trek. I've gone twice.
Whatever you are carrying is a better, lighter deal than these porters carry when they work for an expedition, which can be brutal and pay badly too.
Really, on one trip (three of us walking the Annapurna Circuit) our single porter stacked two backpacks on top of each other and carried them across the Thorong La (18,000 ft), without any shoes on! We had bought him shoes but he just strapped them on the back as well.
Just hire your porter personally, not through a big trekking company. For about the price of a few cups of coffee in the States (not sure of current prices, my last trip was 1997). It's a nice way to help the local economy, and to make a local buddy who can help in many other ways, too.
Just walk around and say "Ek coolie chahencha" (I need one porter)... Then to dicker on price all you need to say is "dhery mahango" (very expensive), slowly and seriously while shaking your head.
They'll be rolling with laughter, and you'll get a decent deal. I really wouldn't worry about the weight of the tripod...