1. Create an El Capitan USB installer using your favorite method. (the Applications folder must be accessible on the USB)
2. Drag & drop the volume on the icon in the app
This app will "inject" the Disk Utility included in OS X Yosemite inside an OS X USB Installer. This will allow you to access both the new and old disk utility from the Utilities menu.
On the Yosemite Disk Utility.app debugMode and advanced-mage-options are enabled by default using a patched version.