I don’t think this will work. Yes, you can stipulate the use of ivermectin in your living will. But that doesn’t mean that the doctors will follow your wishes.
Here’s an imperfect analogy. Suppose you stipulate in your living will that you be treated with large amounts of Irish whiskey. You might sincerely want that to happen. But every doctor involved in your treatment would decline to give you any whiskey.
No Irish whiskey for you, regardless of what’s in your living will.
You have hit the nail on the head, Leaning Right.
Another analogy: Leaving a note on your door, to the local fire dept., stating that, in the event of a fire, they should spray your house with water using only left-to-right motions.
They will ignore your instructions - because "reasons."
Regards,