Shifting Barrel Adjuster Stuck - replace shifter needed?

That is exactly the one i use on that bike and my other bike too, the photos i shared are just a bit old. I was getting cyclers palsy in my hands and VERY bad clawing of my small fingers with a flat bar. It was pretty disturbing. I switched to that exact bar (i ordered 1 but they sent me 2 on accident) so i have been using both and love it, amazon told me that i had previously ordered this exact bar! haha
 
i just got the trigger shifter in but i don't see anyway to easily take off my existing brake arm and cable from the current shifter and use it with my new shifter, does that mean i need to buy a new brake arm?

i cant find any documentation or any brakes that seem to go with the microshift n757 for nexus 7
 
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