"Let alone policy" can be replaced with various synonyms depending on the context. A few alternatives for "let alone" could be "not to mention," "much less," or "far from." These phrases work to express the idea that something is even less likely or applicable than the idea being discussed. As for "policy," options include terms like "plan," "strategy," or "guideline." These synonyms emphasize the intentionality and purpose behind the actions being taken. Using synonyms can help to vary your language and make your writing more interesting to readers.