Regarding the method of first launching the "Install OS X El Capitan" for that I can first use Disk Utility, if I launch it from the Applications folder on the clone, it will be gone after the process completes....
I just launched Install OS X El Capitan-10.11.3.app from /Apps and from a copy on another volume, and I couldn't find any way to get to Disk Utility; I thought you had to be booted into the installer to do that. (Does the installer actually disappear from /Apps if all you do is use DU, or only after you've done a complete installation?)
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