Hi Andrew,
The Tobii EyeX Controller Core is needed by the Tobii Gaze SDK to be able to communicate with the EyeX Controller eye tracker device. It is part of the EyeX Installer Bundle because it is part of the installation of the EyeX Controller eye tracker itself.
Could you explain a little further why you want to remove the need for installing the Tobii EyeX Installer Bundle? There will be no end user using an EyeX eye tracker that will not have installed this, since it is the way to install the eye tracker itself.