Before your story topic gets locked, you can always make a placeholder post in that topic. Just type anything for the time being. After it goes through, you can edit that post, replacing the placeholder text with the next chapter. Or, simply make a new post with the next chapter.
I do this all the time.
My advice was to post the first few paragraphs, then edit to post more paragraphs. If each increment goes through, keep on editing and adding text. If spam is detected, you know which paragraphs contain the problem word. Then you can edit to add one paragraph at a time, or one sentence at a time, until you have narrowed it down to the problem word. Either replace the word with an inoffensive synonym or experiment with misspelling or mispunctuating it so that it will go through.
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