As you noted, once you have the length figured out, you never have to change it. I don't sew and didn't want to pay anyone to sew my cooler loops for me......so I used four pop rivets with backup washers and made my own cooler loops using 4" wide truckers straps. It's works great since all my frames are welded and you can't take the frames apart.So a 1" strap/buckle sewn to a 4" strap? that's brilliant!!
I wonder if they make a 2" corner protector...would fit more common straps. I have permanent 2" loops sewn to sling my cooler and drybox. Once you figure out the height with NRS loop straps, I tend to never really change it...and made the 2" straps that same length, popped the crossbars off the frame, slipped the loops on, and put the frame back together. Saved the loop straps for other uses.