Use custom preamble from tex file for latex export

[reza]

Hi List

Normally when exporting to latex one can set org headers to control the 
latex class and additional packages. I have now a tex file with the 
corresponding latex class and packages I normally use for my documents. 
Is there a way to use this tex file directly in org mode, without having 
to adjust #+LATEX_CLASS and #+LATEX_HEADER? Maybe something like

#+LATEX_PREAMBLE "my-preamble.tex"

Thanks for any hints.

Cheers,
Reza

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