I dont doubt that OEMs and vendors could be sourced from other than US sources. That’s been the situation for awhile. If there was an appetite to do so, it would have already happened. You can can continue to dream about this, but we both know it won’t happen.
Your naive to think that the Chinese, Russian, or whomever else who had the authority to stop a sale wouldn’t step in from time to time. Let me know how helpful the Chinese would be with an aerospace sale to Taiwan with technology that might have a dual military/civil application.