You show your bike as being a 2011: that means that yeah, the adjuster is behind the rubber filler between the mid- fairing and the engine. Still, not much of a problem, simply open the very bottom of that filler and you will find it. I do not <think> you have to remove any fairing screws but you may have to remove the bottom / rear screw to pull the very bottom of the fairing away.
Thank you for the words of encouragement!! The rain ended. So I went back out there with a flashlight and tools. I had to partially remove the mid and lower fairing and then, there it was! So I routed it back out to be external and put everything back. 10 minutes. You are right, I probably could have done it from below, but not without know EXACTLY where it was and what it felt like.
Started it, let it get warm, then adjusted it to 1125rpm for now (wow that adjuster is sensitive). Let's see how it behaves. The idle is still a bit erratic, but I am betting the engine won't just shut off on me now. Should be able to ride tonight if there is no more rain... forecast looks good so far...
I guess any time I remove that fairing, I will have to remember to route that stupid thing to be external. Never paid it any mind, since I have never had any idle problems until now.