Here's the final workaround I've come up with. In Mission Control, open Automater (its icon is a little robot, and it is located in the Other folder by default). Create a New Document -> Application. On the right side (library) look for Run Shell Script and drag that into the workflow. Type /Applications/KSP_osx/Launcher.app/Contents/MacOS/Launcher into the text box and leave everything else as the default, and then save it to the Applications folder (I named it KSP_Hack but you can call it whatever). Finally, to get the icon, open up Finder and navigate to the Applications window, right click on KSP_Hack and click Get Info. Then, in the finder window, find the KSP launcher, and drag it to the icon next to where it says "KSP_Hack" at the very top. The icon should change to the Kerbal icon. Now KSP_Hack looks totally legit, and you'll never know the difference!
