Again - where do you live that “hunting down an obscure pamphlet” is part of the process? I’ve never lived anywhere where it wasn’t a yes-or-no question on a driver’s license form. If you live in such a place, perhaps fixing that should be your priority rather than going after the organs of those who have given no indication that they wish to donate them.
The decision of what to do with one’s body after death is a deeply personal one that should be decided by that person and only that person. If they want to donate their organs, there’s nothing stopping them from making that preference known.
It should not be assumed that the state has power of eminent domain over our bodies and that harvesting us for parts should be the default.