You can still mount the Rostra actuator to the left of the radiator inside the fairing- there is room to do that as shown on an '08 model.
Just my opinion but I would not use the coolant recovery tank mount as the Rostra cable mount for a couple of reasons- the first is that the bolt goes through a plastic ear and you really just cannot properly tighten that fastener. The second reason is that the mounting point is to the side of the end of the cable and all movement / stress of the cable will tend to bend or deflect the cable mount. It would be better to mount to someplace on the bike that is all- metal and more or less in-line with the place where the throttle cable will go.
All of that said, many different people have used very different techniques to use a Rostra on a C-14 and a lot of them seem to work well. Best of luck with yours.
Brian
The Murphkits instructions are good but not really for the 2012. After doing more reading I need to relocate my control unit to right side fairing. I have only found one pic of the cable mount down by the throttle. They used the coolant res tank mounting bolt, but no pic of the connection to the throttle blade. Did a search and did not find much info on this area...Did every one mount the bracket to the coolant tank bolt? Did everyone use the looped cable to attach to throttle?