eeehmm... Sauron couldn't shapeshift anymore. He had the gift to this, but he lost it after The Last Alliance, as did Morgoth years earlier.
And I'm going to repeat the question burrahobbit asked: why would he want to do that? Sauron already was in command of the Nazgūl, so why should he go in battle as the witch-king?
greetings,
lathspell
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'You?' cried Frodo.
'Yes, I, Gandalf the Grey,' said the wizard solemnly. 'There are many powers in the world, for good or for evil. Some are greater than I am. Against some I have not yet been measured. But my time is coming.'
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