Your business supplies the sponsor, the expert the prototype has to satisfy, and the people on each team. The sponsor owns the decision at each gate.
Your customer supplies the problem and, at gate 3, the money. One design partner per candidate is enough. Two is a committee.
I bring the view of where the technology is going, the prototypes, the customer interviews, and the work of forming a company around a candidate that passes, plus founders from the Cornell Tech network when a team needs them. Your engineering team or production partner takes anything validated into production, so the people who already build for you keep building.
Rules about who can see which customer's data hold the whole way through. Every first test runs on public data, synthetic data, or data a customer has approved for the purpose.