Here is another strategy that may not rely on any sewing (depending on the line-loc 3 that you use). I punched four small holes through each Voile strap and threaded some cord through the holes, and then tied a loop. I sewed a bit of grossgrain to hold the line-loc, but there are other means of attaching that adjuster. There’s really nothing else to it. You can simply throw a double loop or a clove hitch around the trekking pole tips, lay the poles parallel to each other in opposite directions, loosely apply the Voile straps so that you can still slide the poles relative to each other, figure out the length that you want via the line lock, and then snug everything down.
You can also rig the line-loc via a prusik knot.
