This is a very interesting idea! I believe it is important to have a diverse pool of ambassadors in order to cultivate meaningful gratitude. Recruiting diverse ambassadors could be difficult for the larger corporations you are targeting. You want to make sure you take advantage of all the talent available. Going in with a marketing plan could help; developing supporting material and awareness efforts to advertise the leadership role will pay off since a variety of advertising medium can dramatically increase the likelihood that the perfect ambassador could apply.