I don't think it's ever a good idea to be dishonest with your clinicians about previous adverse reactions. It can affect medication choices such that you don't get the best medicine for what you need. If you refuse sedation then just tell them that rather than make something up.
Big toe joint fusions are not a rarity. They are quite common and not exactly experimental, although some of the hardware and fixation techniques can evolve.
Mike, I think you would be wise to discuss your questions with your doctor rather than demand certain medications and treatments based on internet forum advice.