Ratiocination of an opensource techie
Actually, there’s a Git “built-in” to do that: see http://progit.org/book/ch6-4.html#making_a_subdirectory_the_new_root or http://help.github.com/split-a-subpath-into-a-new-repo/ (or look for “filter branch” examples).
Thanks for these links and this bit of knowledge I hadn’t. I edited my post to reference this definitely better way get the job done.
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