Just say, "Officer, I don't consent to any searches." If a police officer believes that he has the probable cause, he is going to just search anyway and you can take it up in court after if he's wrong.
If you want to get a sense of my principles and values in a succinct book, check out The Definitive Guide to Libertarian Voluntaryism over at:
https://amzn.to/33sDMkW
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