Yah your right, It looks like we have to remove some plastic to gain access to the lower forktube clamps for proper hook up. That's what lead me to the original question. I need to look at it again seeing I just did a quick glance when I first got the bike.
I believe you can get the necessary access to the lower triple clamp from the top assuming you use soft loops. If I can get my hand inthere to change the light bulbs, I should be able to get at the forks below the top triple clamp. Alternatively, tip the bike upside down so that it's sitting on it's handle bars and the seat and gain access from the wheel side. Once you have the soft loops installed, there's no rule that says you need to remove them and could probably be kept in place with zip ties.
I believe you could run the tie downs as straight down the forks as needed to not touch the plastic. This would pull the bike down into
the trailer and put load on the front suspension (which keeps the bike from bouncing around). Then you'd keep it from tipping over side to side with another set of tie downs, probably on the back end of the bike. The tie downs on the back also assist should one of the front tie downs fail.
Since I will be trailering this year for different reasons, I'm glad this post came up. Gives me something else to ponder and maybe spend money on.