As has been mentioned a few times here on other threads; if you are using the standard handlebars, it's trivial and easy to just remove that unnecessary clamp.
With other bars, I can't comment, cause I'm using the standard ones.
I removed mine some time ago, without making it an issue to my dealer. My mechanic said the same, just remove the clamp. Sure my cable is chaffed up a tiny bit, but it's just cosmetic and I can't really see it, so it doesn't bother me.
Also, even if the cable's black plastic coating gets chaffed bad, I really can't see the metal outer spiral jacket getting damaged, so one still should be able to ride until the new cable arrives!
If Triumph are a little behind on this albeit; little issue, then that's how it is. Nothing really to get upset about. :crying::wink2::smile2:
Love & Peace