Morwen is correct; the WK had basically just Sauron's will and there's no way he'd "convert" (the same as he didn't convert to Saruman - the only possibility would be, if the Balrog possessed the One Ring - or at least we are hinted that in "the Hunt for the Ring", where Saruman says something in that sense to WK - of course, if it's not a hyperbole). But otherwise, I think their battle could - in the best case - appear similar to the battle of Gandalf with the Balrog. I'm not sure how much the "shadow world stuff" will work and how much the Balrog would be able to harm WK, though it's true he's in fact a Maia - but the battle will most likely be a battle of power and sorcery, and if it took place on the Bridge, I'm somehow inclined to think it will end the same as the famous Gandalf vs. Balrog battle.
I am convinced that there was a similar topic already here at the Downs about half a year ago, but I can't seem to be able to find it.
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"Should the story say 'he ate bread,' the dramatic producer can only show 'a piece of bread' according to his taste or fancy, but the hearer of the story will think of bread in general and picture it in some form of his own." -On Fairy-Stories
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