1) Calculate how many lives you can save with your organs. Pre-commit to donate enough money to save as many lives, on top of what you would normally want to donate.

Doesn't sound like a good fix to me. Isn't the donated money necessarily taking away from some other (presumably also life-saving or otherwise valued) endeavor? Instead I'd point out that it's possible to have it both ways: freeze the brain and donate the rest. Not much demand for brain-donors, compared to kidneys or corneas.