Well, let's say it's not feasible. The image editor isn't usable by anything but C2's executable. If you wanted to use it first you'd have to use nw.js because browsers have security to keep webpages from running exe files at will. Next you'd need to reverse engineer the c2 executable to find out where the editor is, how it's called, and the data it uses. Then using that info you'd made a nw.js in c++ or something that setups an eviroment that the image editor expects and somehow launches it and cleans up afterwards. I'd consider that pretty hacky and a lot of work for little gain.
Making your own editor in C2 would be quicker. Even making an image editor in JavaScript and making a plugin for it would be simpler.