Sure, but by flipping the direction, you can just pick an arbitrary person, set up a trust fund that only disburses a certain amount and set this person up for life. If you have 10 people, each contribute $100k, that's a $1 million fund. Fund a person in Nebraska for life with the fund for $36k a year with an annual rate of return of 4% (fairly conservative).

That person is guaranteed the durable benefactor and you can see if their behaviour changes and if they are enhanced through this.