You would have done that by putting the money in a DAF and announcing your policy, rather than providing incentives in what you say is the wrong field. You're signaling that you will use money wastefully (in its direct effects) by your own standards rather than withhold it until a good enough recipient emerges by your standards.

One problem with this is that skeptics like Eliezer would assume that mulitfoliaterose will just move the goal posts when it comes time to pay.