I bought a handlebar sleeve for attaching my bike the day I collected it. It's a robust thing that was fine until I added guards and bar end mirrors. Now, I use it to thread through the lower yoke so that all the contact points are soft. It gives me a soft but firm grip without chafing anything and the secure point is below the fairing. Hope you get what I mean. I wrap the soft sleeve around my yoke and then pull down on it with regular tie-downs. It never touches the fairing if the angle to the trailer pickup point is correct. I used a similar idea for my KTM 1190 which had (seemingly) no way to attach. It just needs a little attention and an extra soft strap and you'll be good.