I think that, apart from the typesetting, the consistent output produced by LaTeX is one of the things that make it look like LaTeX. Make your document look as consistent as possible.Other academic publishers (like Elsevier) also have similar Word templates (use Google to find them). The author section of the IEEE website also provides a 2-column Word template for their papers, resembling quite a lot the LaTeX one.Use the LaTeX Template for Word mentioned by Caramdir (make sure to install the 3 mentioned fonts).
Besides all the ' it isn't possible' advice, what I would advice is:
