Definitely an interesting topic. One could think more about it (and I probably will). Just for now, I see your theory quite plausible - though I don't think the Silent Watchers should necessarily be involved. They were probably built only after the capture of the tower (but the entrapment scenario is very scary and definitely effective). And also, I don't think the "traitor" (Black Númenorean) could have necessarily come from the outside - he could have been in the tower all along and simply was persuaded by the WK to betray his kin. Though passing in their own men, let's say during the regular change of garrison every five years, could have been far easier (maybe).
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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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