() Les Harris <les@lesharris.com>
() Wed, 04 Mar 2015 22:46:10 -0800

   Am I correct in thinking I should add this to
   gnus-article-mode-hook if I want it invoked automatically?

That depends on whether or not it works for you, i suppose.  :-D
Take courage, backup $HOME/* somewhere safe, and try it out!  If
the result is as you desire, cool, write it up for the archives;
if not, cool, public discourse goes on -- no worries either way.

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Thien-Thi Nguyen
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