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  • $\begingroup$ This works for me, as does the Defer[] solution above; I've credited Mr.Wizard for the answer only because he got in first. $\endgroup$ Commented Jul 5, 2012 at 0:06
  • $\begingroup$ I accepted, and then withdrew when I found a problem (discussed in an edit to my question, above). Mr. Wizard has since addressed this problem, so scores the point. $\endgroup$ Commented Jul 5, 2012 at 11:07