You can clone with
HTTPS or Subversion.
I felt sure something like this would have been reported before, but searching for issues containing "WYSIWYG" and "TinyMCE" yielded nothing similar.
Basically, you can't have multiple HTMLEditorConfig's in the CMS. Or rather you can, but the system always defaults to the first defined one, they are not 100% respected.
After a brief chat with Hamish and Stig I came up with the following, but it does need some additional work.