I just got the 100-400 for use on my X-E2 and I am using an Op-Tech sling strap attached to the tripod foot on the lens. I don't like putting too much strain on the lens mount on the camera.
You should remove the inserts in the strap holes because they will wear out the cord. Just push them out with a small screw driver or other small tool. They are there to prevent wear from the metal triangle links.
I use the Op-Tek slings and neck straps. Parts are interchangeable so you can convert from neck strap to sling easily. The sling does not use the tripod mount.
Sent from my iPhone using Tapatalk