I'm just not sure how someone who is not already able to command lead investor-ship through their reputation and added value would be able to sell such a "short deal" to founders. YC can. Maybe they could demonstrate much more effective recruiting.
1) Investor's Share 2) Founder's Share 3) Employee's Share
Founders try to optimize for their own share, but investors basically destroy the employee share to get founders to agree. I don't believe most founders are sophisticated enough to model employee interests until it is too late.
My belief is that a new structure could be sold to founders by being a thought leader. In a world with tons of money and no edge, I believe its worth it for someone to try.
But... I'm not a VC, and personally believe its the most difficult gig in investing (which investing is the most difficult gig in any job long-term). So, take anything I say with a massive grain of salt.