It is unclear whether the intellectual output of eminent scientists is best increased by prolonging their lives through existing medical technology, rather than by increasing their productivity through time-management, sleep-optimization or other techniques. Maybe the goal of your proposed organization would be better achieved by paying someone like David Allen to teach the von Neumanns of today how to be more productive. (MIRI did something similar to this when it hired Kaj Sotala to watch Eliezer Yudkowsky as he worked on his book.)
Anyone who has managed to become an eminent scientist is probably doing a pretty good job at things like time management. Since maintaining healthy habits is not a prerequisite for attaining eminence, that is more likely to be an area where they're lacking.
There is something comically presumptuous about this statement. Von Neumann had very unusual work habits (he liked noise and distraction). He was also phenomenally productive (how many branches of mathematics have YOU helped invent?)
Given that he was (A) smarter and (B) more successful than any life coach you are likely to find, I would be surprised if this sort of coaching added value.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.