To begin with, it is absolutely unacceptable that the nations of the world would submit their sovereignty to an unelected, privately funded organization such as the WHO. The leadership of this organization has been absolutely disastrous over the past two years, resulting in mindless, draconian restrictions that did nothing whatsoever to promote public health and, indeed, led to many more deaths than were necessary. WHO's "guidance" is the greatest global human rights crisis since World War II. Basic civil liberties were arbitrarily suspended across the globe, and millions plunged into poverty. You have no business amassing any more power, and deep in your souls you must know this.
But if there is to be a treaty among nations, the very first clause should be an immutable and inalienable guarantee of the right to informed medical consent for any procedure, and a consequential ban on mandatory vaccination of any kind. Should you include this, it may prevent the planetary uprising you are surely courting with this undemocratic global power grab.