Pakistan would probably need to find ways to dilute US containment policies in the Pacific. However, that would necessitate China-style belligerency in Afghanistan and the Middle East (i.e., create a reason for the US to focus on us), like interfering with the KSA and UAE in Yemen, projecting power through our navy (e.g., SSBNs), and taking hardline pro-China stances on issues. We never were a real ally for the Chinese, so we'd basically have to be that for them to justify that type of offer. Unfortunately, we don't have the stomach for it.