Perhaps you could explain why the particular content needs to be 'in the header position' instead of in the body of the page concerned? From what you've described, it would appear you can achieved the same visual outcome with a small top margin and a 'different first page' layout, with some additional padding content to increase the effective header size on the 2nd & subsequent pages of the Section concerned.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]